Cleanup tools/jenkins/run_performance.sh script

Actually fail on benchmark scenario failure.

Add unary pingpong scenarios for c++

Upgrade go docker image to golang:1.5

Add various options to verify ssl/tls client cert including letting the application handle the authentication.

Generalized nanopb generator script

Delete qps_driver and dependent scripts, add quit to qps_json_driver

Fix some of the scenarios core limits, thread limits, and depth

Enable core-dumps for stress clients and servers when launching stress tests in GKE

Fix crash in pick_first.c if all subchannels turn out to be bad

Update boringssl to latest chromium-stable.

Run Java stress tests on GKE

Eradicate unused interarrival distributions

Improvements to java benchmark integration.

This also fixes the x25519_NEON symbol error when importing the gRPC
Python modules on ARM.

Change-Id: Id98cf6b0f9a3a8f5b88204bd0a6ad2346182ba3d

distributions since we don't use them and it's not sensible
to add them

Expand corpora, improve dictionary

Make RVM ruby accessible by performance tests

application handle the authentication.