Update cloned volumes QoS settings.

Update cloned volumes QoS settings.

The SolidFire device inherits all settings (including QoS) from
the parent on a clone.  This meant that although we were expecting
QoS to be updated when a clone was issued with a different Volume
Type than the parent volume it was never acted upon.

This change fixes that bug by simply adding the *new* qos settings
to the ModifyVolume call after cloning.

Fixes bug: 1184235

Change-Id: I81786a07312027d543b9f06e54dfbf57e6085bc9
(cherry picked from commit 37fa1ef51ef389ed7ac0affb1dd59ba680ca52df)