Remove ruby21 and ruby22 tests (#5277)

* Remove ruby21 and ruby22 tests

* Update test badge

README.md

@@ -60,7 +60,7 @@ how to install protobuf runtime for that specific language:
 | Objective-C                          | [objectivec](objectivec)                                    | | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_cocoapods_integration.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_cocoapods_integration%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_ios_debug.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_ios_debug%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_ios_release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_ios_release%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_osx.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_osx%2Fcontinuous) | |
 | C#                                   | [csharp](csharp)                                            | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-csharp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fcsharp%2Fcontinuous) | | [![Build status](https://ci.appveyor.com/api/projects/status/73ctee6ua4w2ruin?svg=true)](https://ci.appveyor.com/project/protobuf/protobuf) |
 | JavaScript                           | [js](js)                                                    | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-javascript.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjavascript%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-javascript.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fjavascript%2Fcontinuous) | |
-| Ruby                                 | [ruby](ruby)                                                | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-ruby_all.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby_all%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-ruby21.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby21%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-ruby22.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby22%2Fcontinuous) | |
+| Ruby                                 | [ruby](ruby)                                                | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-ruby23.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby23%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-ruby24.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby24%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-ruby25.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby25%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-ruby23.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby23%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-ruby24.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby24%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-ruby25.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby25%2Fcontinuous) | |
 | Go                                   | [golang/protobuf](https://github.com/golang/protobuf)       | | | |
 | PHP                                  | [php](php)                                                  | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-php_all.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fphp_all%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-32-bit.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2F32-bit%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-php5.6_mac.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fphp5.6_mac%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-php7.0_mac.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fphp7.0_mac%2Fcontinuous) | |
 | Dart                                 | [dart-lang/protobuf](https://github.com/dart-lang/protobuf) | [![Build Status](https://travis-ci.org/dart-lang/protobuf.svg?branch=master)](https://travis-ci.org/dart-lang/protobuf) | | |

kokoro/linux/ruby_all/build.sh

-#!/bin/bash
-#
-# This is the top-level script we give to Kokoro as the entry point for
-# running the "pull request" project:
-#
-# This script selects a specific Dockerfile (for building a Docker image) and
-# a script to run inside that image.  Then we delegate to the general
-# build_and_run_docker.sh script.
-
-# Change to repo root
-cd $(dirname $0)/../../..
-
-export DOCKERFILE_DIR=kokoro/linux/64-bit
-export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
-export OUTPUT_DIR=testoutput
-export TEST_SET="ruby_all"
-./kokoro/linux/build_and_run_docker.sh

kokoro/linux/ruby_all/continuous.cfg

-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/linux/ruby_all/build.sh"
-timeout_mins: 120
-
-action {
-  define_artifacts {
-    regex: "**/sponge_log.xml"
-  }
-}

kokoro/linux/ruby_all/presubmit.cfg

-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/linux/ruby_all/build.sh"
-timeout_mins: 120
-
-action {
-  define_artifacts {
-    regex: "**/sponge_log.xml"
-  }
-}

kokoro/macos/ruby21/build.sh

-#!/bin/bash
-#
-# Build file to set up and run tests
-
-# Change to repo root
-cd $(dirname $0)/../../..
-
-# Prepare worker environment to run tests
-source kokoro/macos/prepare_build_macos_rc
-
-./tests.sh ruby21

kokoro/macos/ruby21/continuous.cfg

-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/macos/ruby21/build.sh"
-timeout_mins: 1440

kokoro/macos/ruby21/presubmit.cfg

-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/macos/ruby21/build.sh"
-timeout_mins: 1440

kokoro/macos/ruby22/build.sh

-#!/bin/bash
-#
-# Build file to set up and run tests
-
-# Change to repo root
-cd $(dirname $0)/../../..
-
-# Prepare worker environment to run tests
-source kokoro/macos/prepare_build_macos_rc
-
-./tests.sh ruby22

kokoro/macos/ruby22/continuous.cfg

-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/macos/ruby22/build.sh"
-timeout_mins: 1440

kokoro/macos/ruby22/presubmit.cfg

-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/macos/ruby22/build.sh"
-timeout_mins: 1440

tests.sh

@@ -244,14 +244,6 @@ build_python_compatibility() {
   ./test.sh 3.0.0-beta-1
 }
 
-build_ruby21() {
-  internal_build_cpp  # For conformance tests.
-  cd ruby && bash travis-test.sh ruby-2.1 && cd ..
-}
-build_ruby22() {
-  internal_build_cpp  # For conformance tests.
-  cd ruby && bash travis-test.sh ruby-2.2 && cd ..
-}
 build_ruby23() {
   internal_build_cpp  # For conformance tests.
   cd ruby && bash travis-test.sh ruby-2.3.8 && cd ..
@@ -571,8 +563,6 @@ Usage: $0 { cpp |
             python |
             python_cpp |
             python_compatibility |
-            ruby21 |
-            ruby22 |
             ruby23 |
             ruby24 |
             ruby25 |