[BZ 1083894] - Storage node's cluster status "NORMAL" written in RED cannot be changed - Adding a way to our UI to explicitly reset error message and last failed operation on the rhq_storage_node table.

(cherry picked from commit ed4714ee81a3b59e2350523cea16e17fc7bc0084)
Signed-off-by: Jirka Kremser <jkremser@redhat.com>