Fixes the provisioning on selected volumes for NetApp 7 mode.

The current direct driver for 7 mode provisions openstack
volume on all NetApp 7 mode volumes mixing openstack volumes
with all non openstack volumes. This fix allows volume selection
by the user to keep openstack volumes separate from non opnestack
block storage entities.

bug 1132834

Change-Id: I77b78ce304e72482724b6ff7c52795c60992243e
Merge "Fixes the provisioning on selected volumes for NetApp 7 mode."