Dell SC: Enable use of Storage Profiles

Dell SC: Enable use of Storage Profiles

The Storage Center array allows volumes to be associated with
different Storage Profiles. These profiles allow setting tiering
and RAID types per volume. The driver currently only uses the
default Storage Profile configured for the Cinder user account.

This patch adds the capability to use different Storage Profiles
by using extra specs to allow the creation of different volume
types for the desired profiles.

DocImpact

Change-Id: Icf76fceca5a0ae20bb08b276b0c41ef6cdb31087