[autotest] Add double provision to push_to_prod suite.

Also, remove any cros-version label to force provision to run. Note that
this does not exercise the full autoupdate code path as DUT already has the
same CrOS version.

Per comment in:
https://code.google.com/p/chromium/issues/detail?id=444036#c11

BUG=chromium:444036
TEST=local run, confirm labels are removed.

Change-Id: Iea236483cf6eb58102036f7dc74607173b940637
Reviewed-on: https://chromium-review.googlesource.com/237321
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
2 files changed