Adding the -online option to the 3PAR clone

The 3PAR drivers had to wait while the clone was being performed
and this would take a considerable amount of time for large volumes.
This patch takes advantage of the 3PAR backend by using the -online
option in the command that we were calling to perform the copy. This
allows us to remove the sleep in the driver. Using the -online
option forced us to change some of the delete_volume code because
the 3PAR backend will not allow a volume that was copied to be added
to a virtual volume set.

DocImpact

Change-Id: I47d72063c858e2eee10756be4f74febdd1603179
Fixes: bug 1208586
Merge "Adding the -online option to the 3PAR clone"