HP 3PAR Doc changes for QOS feature

Added doc changes for the new QoS feature for the HP 3PAR
drivers, also removed the iSCSI tag on copy volume to image
and copy image to volume as the FC driver now supports it.

Change-Id: I151ada4c797ef980203fa665ab6b6942156351cf
Fixes: bug 1202779
Merge "HP 3PAR Doc changes for QOS feature"