alert: Send alert for ha'ed vm's

When ha is performed on vm's send the alert for it so that
its for admins to know which vm's got ha'ed else its time
consuming to get those details from logs

server/src/main/java/com/cloud/ha/HighAvailabilityManagerImpl.java

@@ -608,7 +608,9 @@ protected Long restart(final HaWorkVO work) {
 
             VMInstanceVO started = _instanceDao.findById(vm.getId());
             if (started != null && started.getState() == VirtualMachine.State.Running) {
+                String message = String.format("HA on VM: %s", started.getHostName());
                 s_logger.info("VM is now restarted: " + vmId + " on " + started.getHostId());
+                _alertMgr.sendAlert(alertType, vm.getDataCenterId(), vm.getPodIdToDeployIn(), message, message);
                 return null;
             }