Create group from snapshot-group failure leaves behind the volume
Create group from snapshot-group failure leaves behind the volume

While creating a group from snapshot group or source group, if the
quota exceeds during volume creation, the volume which are scheduled
for creation are left behind in the DB.Only Group gets destroyed from
the DB. To solve this, If error happens, taskflow will handle
rollback of quota and removal of volume entry in the db.

Change-Id: I5d60680fa92e50e51c9b3a6bcc940b18bef5b150
Closes-Bug: #1727314

phenoxim/cinder,phenoxim/cinder,Datera/cinder,Datera/cinder,openstack/cinder,mahak/cinder,mahak/cinder,j-griffith/cinder,openstack/cinder,j-griffith/cinder