Properly set server payload config in QPS tests

Update clang-format to 3.8

Add scripts for creating performance worker VMs

Change c++_codegen_lib from build: protoc to build: all

fixes to tests for py2/3 syntax compatibility

Don't check read_info for writes

Adding an argument to bad_ssl_cert in order to override the location of the test certificate.

PHP: remove hardcoded version in templates

Fix Node status code usage to match spec

Revert for good "Pass a non-infinite deadline to grpc_completion_queue_next() to prevent queues from blocking indefinitely in poll()"

DocFixit: Troubleshooting info for Windows and some minor tweaks

Fix copyright for metrics.proto

Fix failure handling code

Fix some issues in building under certain configurations

Python 3: fix a bytes/str runtime issue

Specification for stress test clients

Add HTTP request parsing

Fix timeout decoding logic for times that become infinite

python 2/3 compatible abstract servicers/stubs

Python: py3 compatibility for test runner & loader