SIO: Clean up padded volume comments
SIO: Clean up padded volume comments

There were a couple of spots still referring specifically to thick
provisioned volumes as being an issue without padding enabled. This is
an issue regardless of provisioning type, so this cleans up those
mentions.

Change-Id: Ife3e6cabe9ce3ba2090fc23c02c4d40493586320
Signed-off-by: Sean McGinnis <961eeb09b6d45516665e15b82e013282c4faf575@gmail.com>

mahak/cinder,mahak/cinder,openstack/cinder,openstack/cinder