version_info added to OSWL serialization

For sending version_info data from OSWL we need to have it
in the OSWL serializer.

Change-Id: If6c909ba15dac947888069bb3f3339a2d473694e
Closes-Bug: #1547558

nailgun/nailgun/objects/serializers/oswl.py

@@ -25,4 +25,5 @@ class OpenStackWorkloadStatsSerializer(BasicSerializer):
         "resource_type",
         "resource_data",
         "resource_checksum",
+        "version_info"
     )

nailgun/nailgun/test/unit/fuel_statistics_tests/test_oswl_object.py

@@ -98,3 +98,21 @@ class TestOSWLObject(BaseTestCase):
             consts.OSWL_RESOURCE_TYPES.vm
         )
         self.assertIsNotNone(untouched_obj)
+
+    def test_version_info_serialized(self):
+        version_info = {'release': '9.0'}
+        dt = datetime.datetime.utcnow()
+        obj = OpenStackWorkloadStats.create(
+            {
+                'cluster_id': 1,
+                'resource_type': consts.OSWL_RESOURCE_TYPES.vm,
+                'created_date': dt.date(),
+                'updated_time': dt.time(),
+                'resource_checksum': "",
+                'version_info': version_info
+            }
+        )
+        self.assertEqual(
+            version_info,
+            OpenStackWorkloadStats.to_dict(obj)['version_info']
+        )

nailgun/nailgun/test/unit/fuel_statistics_tests/test_statsender.py

@@ -302,6 +302,7 @@ class TestStatisticsSender(BaseTestCase):
             'resource_checksum': '',
             'master_node_uid': None,
             'resource_data': None,
+            'version_info': {}
         }]}
         send_data_to_url.assert_called_once_with(
             url=sender.build_collector_url("COLLECTOR_OSWL_INFO_URL"),