Fix Python protoc plugin test workflow

Crash in channel/server creation if grpc_init not called

Moves the Python protoc plugin output directory to an auto-generated
temporary directory. Has the build configuration set by environment
variable (consistent with `tools/run-tests/run_tests.py`'s set envvars).

Don't call grpc_create_chttp2_transport after destroying the server

Add synchronization in server_secure_chttp2.c to avoid propagating a
completed handshake past that layer to a potentially already destroyed
server.

Adding csharp to test suite

temp remove timing out test to investigate

Node 0.11+ compatibility

Cleaned up some unnecessary verbosity in Node's binding.gyp

Allows:
- running python tests in parallel
- clearer Travis output
- subjects each python test to the five minute run_tests timeout,
  instead of ALL the tests to the five minute timeout
- easier benchmarking of which tests are slow

Support ruby 2.2.0

QPS driver

Manually resolve well-known service names

Fix ref counting

Fix signed comparison warnings in low_level_ping_pong

Fixing Windows build of the python protoc plugin.