Solution: add tests for zmq_bind, zmq_connect and zmq_z85_decode

Solution: add simple, initial tests for client and server

Solution: port the 2 new tests from oss-fuzz, and wire them up to
be ran manually with a static input in normal builds.
Add a specific configure option to use the external fuzzing engine
from oss-fuzz.

Solution: don't run it

* Allow CMAKE to generate ws and wss transports
I guess there is little use of just ws transport, so by default
GnuTLS (and libsodium) are enabled

* cmake libzmq including wss transport (ubuntu 19.10 and ubuntu 19.10 + wsl 1.0)
test_security_fails (libsodium assert !?)

* updated relicense

* make external libs gnutls nss sodium optional

* #ifdef WSS classes and functions, build test*ws* only if correct libs are included, warning if libs not present

* make libsodium optional

* cmake fix tests TIPC transport

* clang-format pointed out a wrongly placed #ifdef

* GnuTLS before 3.6.7 is not safe

* msvc doesn't agree with strlen in array declaration, test_socks now at least compiles on windows

* windows: libsodium build fails, missing include dirs set by env var

* ws transport test only works when GnuTLS is found

* Fixed condition to use NSS / built in SHA1, so that test_ws_transport should now pass, also when GnuTLS is not found

* Problem: boilerplate when init msg from data copy

Solution: Add zmq_msg_init_buffer to construct
a message by copying memory from buffer.

* add option to stop trying to reconnect on ECONNREFUSED

Solution: a new socket type, called PEER. Very similar to SERVER, but can only connect to other PEERs. Also a new zmq_connect_peer method, that connect and return a routing-id in thread-safe and atomic operation

Solution: increase timeout to 15 seconds

Solution: add an option to enable it, and default to false. Enable it in
the CI so we don't lose coverage, as it works on Travis.

Fixes #3725

Solution: implement support

 Support XPub socket send last value caching to last subscription pipe with ZMQ_XPUB_MANUAL_LAST_VALUE. (#3511)

* Add ZMQ_XPUB_MANUAL_LAST_VALUE

* Surpport xpub send last value caching to one pipe with ZMQ_XPUB_MANUAL_LAST_VALUE

* Add test_xpubub_manual_last_value

* Add relicense and doc

Solution: libm and libsocket have to be linked explicitely

Solution: remove and add where needed

Solution: move test utilities to separate testutil library

Solution: migrate to Unity

Solution: migrate to Unity and separate test_security_no_zap_handler

This reverts commit ac19d5f4.

Solution: add test case run with cap_net_admin
Fixes #3397

Solution: define UNITY_SUPPORT_64 to force 64 bit support

Solution: move general monitoring test utilities to new testutil_monitoring

Add new HWM tests and more detailed documentation

- Lowercase all commands
- Unify indent to 2 spaces
- Remove spaces around brackets
- Remove repitition of condition in else(...) and endif(...)

Note: (re-)running CMake did not change the content of the generated files

Solution: merge into a single test_use_fd and reduce code duplication by extracting common functions

Problem: test program test_unbind_inproc is redundant, the same is already tested in test_inproc_connect

Solution: remove test_unbind_inproc

Use ZeroMQ_SOURCE_DIR, ZeroMQ_BINARY_DIR instead of CMAKE_SOURCE_DIR, CMAKE_BINARY_DIR in tests/CMakeLists.txt
Similar reason to change unittests/CMakeLists.txt

* Add ZMQ_ROUTER_NOTIFY draft socket option

Solution: add some msg helpers to parse commands, and check for
subscribe or cancel commands and process them accordingly in the xpub
and xsub classes.

Solution: guard CMake statement properly

Solution: specify not to use stdint.h for VS<=2008, fixes #3025

Solution: fix indentation

Solution: increase timeout

Solution: increase timeout, remove timeout settings for unsupported poll poller

Solution: check more socket type to cover other session managers.
Increase timeout as the test now takes ~12 seconds.

Solution: migrate to unity, merge into test_radio_dish, and split up test cases

Solution: add appropriate definitions to build

Lets the application set per-connection metadata.
Metadata is specified as "X-key:value" and set using zmq_setsockopt, eg:
zmq_setsockopt (s, ZMQ_METADATA, "X-key:value", 11);

The peer can then obtain the metadata from a received message:
char *data = zmq_msg_gets(msg, "X-key");

Solution: migrate to unity

* Problem: TIPC availability check is too strict

Solution: at build time only check if the API is available. In the tests
do a first check and a skip if the functionality is not available.

TIPC needs an in-tree but not loaded by default kernel module, tipc.ko
to be loaded, which requires root, so it is unlikely to be available on
any build system by default.
This will allow most distributions to ship with TIPC support built in,
and to avoid tests failure if the module is not there.

* Problem: no Travis tests for TIPC

Solution: mark one job with sudo: required and load the kernel module

* Problem: CMake fails when test returns 77 (skip)

Solution: set property to let it mark the test as skipped as intended