Don't set ahead/behind on independent queues.

Change-Id: I6507896e9980eee4ac13ff8bd94f0e32947cd5d8
Reviewed-on: https://review.openstack.org/12279
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
1 file changed