Fix redis service restarting for Ceilometer

In Ubuntu redis service is named as redis-server. So in this
patchset different restarting for this service at different
OSes have been added.

Change-Id: I406e3556c7b9a2bef8277f34862375c5ffd3888e
Closes-bug: #1405147
Merge "Fix redis service restarting for Ceilometer"