Revert "devstack: Set an optimal processing queue"
Revert "devstack: Set an optimal processing queue"

This reverts commit f1bdf6751a503ee570ce114f9a31fdb2959a79d0.

this causes distribution to be either 50/50 or 100/0. in the latter
case, the single worker usually fails to process pipeline queues in a
timely manner

Change-Id: I7c34acb29290de641ccbef4844e1e6982fe8b173

openstack/ceilometer,openstack/ceilometer