Add status_message to objects and notifications

This patch is part of the skipped action blueprint. It adds the
`status_message` field to the Audit, ActionPlan and Action objects and
all related notifications.

It bumps the versions of all the affected objects and notifications and
update the tests to include the new fields.

Change-Id: I3b9467e7e37188e647379cd9c4cbbda8ed75383f
Signed-off-by: Alfredo Moralejo <amoralej@redhat.com>

doc/notification_samples/action-execution-end.json

@@ -14,6 +14,7 @@
       "created_at": "2016-10-18T09:52:05Z",
       "updated_at": null,
       "state": "SUCCEEDED",
+      "status_message": null,
       "action_plan": {
         "watcher_object.namespace": "watcher",
         "watcher_object.version": "1.0",
@@ -24,6 +25,7 @@
           "created_at": "2016-10-18T09:52:05Z",
           "updated_at": null,
           "state": "ONGOING",
+          "status_message": null,
           "audit_uuid": "10a47dd1-4874-4298-91cf-eff046dbdb8d",
           "strategy_uuid": "cb3d0b58-4415-4d90-b75b-1e96878730e3",
           "deleted_at": null