Restart jobs behind a removed change.

Even though we're removing from (potentially) the middle of the
queue, restart jobs behind this change since the situation has
changed.

Change-Id: Iab44898bda07d991a3d4c53715bf7a04ff58c9d1
Reviewed-on: https://review.openstack.org/23038
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
Make trigger/result queue lengths available to status page.

Change-Id: I79fc7d1df0612fbe87e9b61499111c2d08d78dd0
Reviewed-on: https://review.openstack.org/23046
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins