Admins can set the 'locked' property on a group view, and this will
stop non-admin members from editing the view, regardless of the view
editing permissions given to roles within the group.

Change-Id: I56c113a9d4e8fcab5463fa1c54bf456f7fc2364b
Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>