NetApp: Fix for snapshot not deleted in error state.

This fix enables cleaning of volumes/snapshots
in error state by allowing them to delete.
It will allow the delete call to be
successful if snapshot/volume are in
error state. This also fixes the bug
raised recently with  number 1145409 which seems
to be duplicate of 1143661.

bug 1143661
bug 1145409

Change-Id: I38bc13e676404f96db54b12edfa56680489e893e
Merge "NetApp: Fix for snapshot not deleted in error state."