devserver: Allow quick provision to be requested for cros_au RPC.

BUG=chromium:779870
TEST=curl "http://${ds}/stage?archive_url=gs://chromeos-image-archive/${build}&artifacts=quick_provision,stateful"; curl "http://${ds}/cros_au?full_update=False&force_update=True&build_name=${build}&host_name=${dut}&async=False&clobber_stateful=True&quick_provision=True"

Change-Id: I24fac73509a718d42cf64ec55f9597a235f6eca8
Reviewed-on: https://chromium-review.googlesource.com/751793
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
2 files changed