fix h2 big response not sending bug

fix discovery docancel request return error response

update cmake docs after fixing pull/620

fix glog name problem in cmake

add discovery client

Feature: Add always_print_primitive_fields flags into Controller and …

Update .bazelrc

set ture if dumps all fields to json in protobuf3.

Support Prometheus output

update avalanche.md

string_splitter supports embedded '\0' characters and separator can be '\0'