clang-format c++ code

Dodging VisualStudio's #define of max().

Add jwt_token_creds test case to interop test for c++

Print out status when it is not ok in interop tests

Node differentiate between binary and string headers

Fixes for Windows atomics.

Adds a dockerfile and script for building a tar archive containing protoc and the plugins

- the name includes a version
- the top-level directory of the tar has the same name as the archive

-) gpr_atm_no_barrier_load should actually return something.
-) If compiling under mingw32, your compiler is gcc and gcc atomics become available.

Adds back calls to #finish at the end of server calls

Exposes the metadata method in server-side ActiveCall view classes

Add csharp server

wrap refresh token credentials in c++

Fixes reference to variable in the auth package

Unconditionally add a newline if a test times out or fails.

Failure should generally result in output unless something goes wrong,
but timeout currently doesn't, but should be printed 100% of the time.

Factor out interface-specific early_adopter code

Refactors early_adopter such that interface-specific code is located in
the framework module as a submodule `alpha`.

Python refactor

This renaming has been incrementally happening for the last several
weeks and this change finishes it.

Use "host" header field if ":authority" is not present

They were two halves of the same whole.

Introduces "make test_python" which runs python tests.