- ensures that servers cancels calls after the shutdown timeout
- uses an infinite timeout when request server calls

This two changes fix the issue where the server segfaults on shutdown.

- moves the client/server behaviour to pb/test
  - deprecate current bin/interop/interop_{client,server}.rb
- adds executable endpoints to bin
  - grpc_ruby_interop_{client, server}
  - these will be added to the ruby bin path when the grpc gem
    gem is installed, making them easier to execute

- Updates the code generated for the interop service
- Moves the generated interop service/client from bin to pb

Also
- removes an empty file from the health pb directories

Corrects some other issues

- fixes status return when calls fail by always returning the status

- resolves bidi_call client's failure to return an exception on bad
  status by swapping the wait for status to the read thread

  * this also improves the cancel_after_first_response test

Also

- adds a unit test that verifies that a bidi call will time out.

- introduces a #wait method on the call operation view
- invokes #wait on a Notifier that is created for all operations
- ensures the Notifier is invoked if necessary whenever a client request
  completes
- updates the interop_test to use op.wait before checking if the call
  was cancelled.

- stops attempting to verify by catching the CancelledError

- instead the test examines the operation state after cancellation,
  which is equally valid and more stable.

Also
- simplifies bidi on the server

- The SANs take precedence over the CN.
- The CN is only checked if there are no SANs.
- Fixing the tests as the test cert did not list *.test.google.com in
  the SANs. Will fix the test cert another time...