During a grenade upgrade the Designate grenade plugin updates the
python-designateclient. This can cause the installation location to change
to under the /opt/stack/new path.
This patch makes sure we restart neutron q-svc after this update to make sure
it can still find the client.
Change-Id: I5ce96268cb39ae4a4a8d82a75ac192b2310455a1