Fixed argument types in setup.py

Anonymous API implementation

Defaulting run_tests to just opt.

Remove dead code

Put back C++ JWTCredentials code and add a test case in interop test.

remove 'else' code, release lock by destructor

Allowing us to import google::protobuf::int64.

If for any reason, our definition of gpr_int64 is different from the definition of google::protobuf::int64, the virtual override would fail, as this needs to be of the precisely exactly the same type.
That change allows us to use protobuf's int64 definition.

Switched protobufjs dependency to npm package instead of GitHub

Adding support for alternative protobuf libraries.

Add a no_barrier_load atomic operation.

Fix duplicated symbols

Fix port selection for Python server.

Removing the "using std::string" in the python plugin code.

Fix client sending invalid GOAWAY last-stream-id

Commit 31e65bea introduces a bug which causes starting server on a randomly
selected port.

Fix duplicated symbols caused by having definition instead of declaration in
header file.

Adding refresh token credentials.

Update Python Dockerfile's unit test list

Improved node install instructions and bumped version