Add more config options to stress tests and export metrics

Support dynamic HPACK table resizing

Performance proto polishing

Provide performance workers for C#

Add cipher suite test to http2 interop tests, and honor test_case flag

Use mako template for HTML report.

Helper functions for creating/destroying Pods and Services in GKE

Core transport & call cleanup

requiring tmpdir to resolve undefined method error

Core credentials API refactoring

Fixing NULL terminator for test cert.

Forgot to do that when I replaced the cert in #4096. Thanks asan for
catching that!

Updating the server1 cert so that it can be used with Go.

Merge release-0_11 into master