Backport of pull request #2313 into release-0_10.

Handle settings frame making a stream writable

Fix race in TCP connection

Eating the error code from run_test.py, as Jenkins now uses report.xm…

Update Python version numbers

If the TCP client connection alarm triggers close to the connection
deadline (but succeeds), the alarm shuts down the endpoint underneath
the existing transport... which is very bad for its health.

Bumped Node.js package version to 0.10.0

Update dockerfile of gRpc Android interop test to use the code inside grpc-java repository.

Split mu_call into a server-wide and a per-call lock

Adding support for raw access token credentials.

Support registering services against specific hosts

Add metadata refcount debug helpers

Creating a branch during the Jenkins build to silence a warning.

Adds an interop test: oauth2_auth_token

Adding MacOS support in our run_jenkins script.

Adding JWT verifier.

Don't use pkg-config to look for perftools

Fix a few issues with pkg-config file generation

Fixing variable names discrepancy in ruby's extension builder.

CONFIG != GRPC_CONFIG, meaning we're always building released, even in debug.

Use pkg-config if possible when building the ruby extension

Don't send terminal escapes if we're outputing to a file

Fix TSAN reported bug

Fixing json doc.