Use loopingcall from openstack-common

This removes cinder.utils.LoopingCall and uses the copy in
openstack-common instead.

Change-Id: Id76b89797dffcc65fbf37fd1442f221ff5bb4668
Merge "Use loopingcall from openstack-common"
(Test commit) Change README to reflect Jio's fork of Cinder

Change-Id: I3f26c0a736e63725aec24ca2fa12c707b8e6460f