Add a new reno note to specify that migration status is changed from 'failed' to 'error' on live-migration failure. That was landed as change I7a0c5a32349b0d3604802d22e83a3c2dab4b1370 Change-Id: I4e1693fa52bcb33b8770ec59640890abd2b911c8 Closes-bug: #1588888