Fix alert for quarantined bots.
Fix alert for quarantined bots.

This ensures that the bot was quarantined for the full 10m before alerting.

BUG=skia:

Change-Id: Ida3de11c2f3a8784abb689e6df4fc773542c2afb
Reviewed-on: https://skia-review.googlesource.com/8313
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot