Revert "[prom] Move to alertserver 0.6.1"
Revert "[prom] Move to alertserver 0.6.1"

This reverts commit bdf561bfb9fc6a9337bf6bd748dab0e789480c0e.

Reason for revert: Silences don't seem to work.

Original change's description:
> [prom] Move to alertserver 0.6.1
> 
> BUG=skia:
> 
> Change-Id: Iffb8837d47c92d4d0d673c78128c50079306985d
> Reviewed-on: https://skia-review.googlesource.com/15199
> Reviewed-by: Ravi Mistry <rmistry@google.com>
> Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
> 

TBR=rmistry@google.com,b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Change-Id: Ib3098b79cc3f5f93fc647a418af4b7d8d7b144da
Reviewed-on: https://skia-review.googlesource.com/15240
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