Volume raid UI fixed issues:

1. Migrate button shown even if all options are provided to UI as false
from backend

Sample:
migrate: {'to_raid1' : false, 'to_raid5':false,
             'to_raid10':false, mode='online', disks=[]}

             2. Volume Type is not displayed on screen. "SPAN/RAID" not
             seen on the info section

             3. When one of the create/extend/migrate operations are triggered on volumes page,
             the info (Grey section) of the page displays HDD info for
             some random disk.

             4. raid type given to migrate_volume should be the
             target type to which volume should be migrated.
             Example: if volume is migrated from SPAN to RAID1
             'raid' : "RAID1" should be the input
             currently it sends the
             current type and not the
             target type