This will hopefully make xctool work on Travis too (cross fingers!)

Technically unnecessary, but for consistency with the other beta releases.

have a gpr public function which returns cycle clock.

run_tests.py will start a server (if it's not running, or if the running
port server mismatches the 'current' one) that serves ports to use for
tests. The server is left running after run_tests.py finishes, so that
in environments such as Mac and Windows where tests run unshielded from
each other, we don't start jumping on already used ports.

Currently, if two threads call grpc_completion_queue_pluck on the same
completion queue for different tags, there is a 50% chance that we
deliver the completion wakeup to the wrong poller - forcing the correct
poller to wait until its polling times out before it can return an event
up to the application.

This change tweaks our polling interfaces so that we can indeed wake a
specific poller.

Nothing has been performance tuned yet. It's definitely sub-optimal in a
number of places. Wakeup file-descriptors should be recycled. We should
have a path that avoids calling poll() followed by epoll(). We can
probably live without it right at the second though.

This code will fail on Windows at least (I'll do that port when I'm in the office and have a Windows
machine).

Readd the commented-out config to suppress warnings, to have it handy
for submissions.

Initial plumbing work; needs tests and more client_channel
implementation.

Tests not yet included.

Still missing:
- Caching of the already checked JWTs (although it could be done at an
  upper layer).
- Caching of the jwks_uri to avoid 2 roundtrips for each verification.