Report buildset result in MQTT reporter

Change-Id: I9682caf98af870677e92a17fc822e0c570cea8df

doc/source/reference/drivers/mqtt.rst

@@ -66,6 +66,10 @@ An MQTT report uses this schema:
 
       The buildset global uuid.
 
+      .. attr:: result
+
+      The buildset result
+
       .. attr:: builds
 
       The list of builds.

tests/unit/test_connection.py

@@ -472,6 +472,7 @@ class TestMQTTConnection(ZuulTestCase):
         mqtt_payload = start_event['msg']
         self.assertEquals(mqtt_payload['project'], 'org/project')
         self.assertEquals(mqtt_payload['branch'], 'master')
+        self.assertEquals(mqtt_payload['buildset']['result'], None)
         self.assertEquals(mqtt_payload['buildset']['builds'][0]['job_name'],
                           'test')
         self.assertNotIn('result', mqtt_payload['buildset']['builds'][0])
@@ -481,6 +482,7 @@ class TestMQTTConnection(ZuulTestCase):
         mqtt_payload = success_event['msg']
         self.assertEquals(mqtt_payload['project'], 'org/project')
         self.assertEquals(mqtt_payload['branch'], 'master')
+        self.assertEquals(mqtt_payload['buildset']['result'], 'SUCCESS')
         builds = mqtt_payload['buildset']['builds']
         test_job = [b for b in builds if b['job_name'] == 'test'][0]
         dependent_test_job = [

zuul/driver/mqtt/mqttreporter.py

@@ -47,6 +47,7 @@ class MQTTReporter(BaseReporter):
             'enqueue_time': item.enqueue_time,
             'buildset': {
                 'uuid': item.current_build_set.uuid,
+                'result': item.current_build_set.result,
                 'builds': []
             },
             'zuul_event_id': item.event.zuul_event_id,