[autotest] Endpoints for syncing jobs and hqes back to master

The status of jobs that were completed on a shard should be visible
in the master AFE, so a human can easily see which jobs have been run in one
central place.

This adds the functionality to the AFE to retrieve newer versions of
jobs and hqes from shards.

BUG=None
DEPLOY=apache, afe
TEST=Ran Suites

Change-Id: I04c3401921a3f54bae6070639af805904952bf6a
Reviewed-on: https://chromium-review.googlesource.com/213901
Reviewed-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Jakob Jülich <jakobjuelich@chromium.org>
Tested-by: Jakob Jülich <jakobjuelich@chromium.org>
7 files changed