Update 3PAR block storage docs

Document the new QoS settings for the HP 3PAR client.
They are now using the qos_specs instead on putting
them in the extra_specs. Also, qos_specs do not require
the scoping of the keys like the extra_specs did.

Added two new personas along with a few minor edit.

Change-Id: Ibbbf430dd19744e7c45e6e7e4f8374bb61606535
Closes-Bug: #1283181
Merge "Update 3PAR block storage docs"