Support parameter to change PHP generated stub suffix

Ensure that GRPC_VERBOSITY is checked before logging

alwayslink=1 for reflection plugin

Free pending grpclb update args

Fix linux artifacts on Kokoro

Added all previous minor releases of gRPC to the matrix.  

Check for no_proxy environment variable and skip proxy if host is listed

This will fix #9989, #11603, #11751.
no_proxy is typically comma separated list of hosts and or domains. Matching must be from the end of the uri to accomodate whole domain and subdomain whitelisting.

This will work for well-formed no_proxy strings, but may fail if there are additional spaces.

Add a new metric and enable internal credential types in QPS Driver

Added all previous minor releases of gRPC to the matrix.  Modified the testsuite name format for better display test results in sponge.

Fix python 2.7 & 3.4 artifacts on kokoro

Add idiomatic C++ API for grpc::Slice construction

Do not return calls on server when request proto fails to deserialize.

require using grpc_slice

Restore interop_client_main

Add GTS plugin

Fix image path when pulled from dockerhub.

Narrow src/python/.gitignore to only what it needs to ignore.

Fix fd_orphan() in ev_epollsig_linux

"proto" and "*.egg-info/" are no longer generated, "src/" can be
narrowed to "/src/", and "*_pb2.py" and "*_pb2_grpc.py" are covered by
.gitignore files in parent directories.

Added C++ to interop_matrix and created a kokoro config

Set owners for client_channel tree.

Implement stream compression lib module

Add policy to comments

Reset OWNERS state