Update json module to jsonutils

oslo project provide jsonutils, and the others use it in many place,
this PS to update the json module to oslo jsonutils for consistency.

Change-Id: Ie8bdc41e420fbbbafaca7d7eaeaa702d93c6a18d

vitrage_tempest_plugin/tests/api/rca/base.py

@@ -12,9 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import json
-
 from oslo_log import log as logging
+from oslo_serialization import jsonutils
 from testtools import matchers
 
 from vitrage_tempest_plugin.tests.base import BaseVitrageTempest
@@ -70,7 +69,7 @@ class BaseRcaTest(BaseVitrageTempest):
         LOG.debug("The rca taken from cli is : %s", cli_rca)
         LOG.debug("The rca taken by api is : %s", api_rca)
 
-        parsed_rca = json.loads(cli_rca)
+        parsed_rca = jsonutils.loads(cli_rca)
         sorted_cli_graph = self._clean_timestamps(sorted(parsed_rca.items()))
         sorted_api_graph = self._clean_timestamps(sorted(api_rca.items()))
         self.assert_list_equal(sorted_cli_graph, sorted_api_graph)

vitrage_tempest_plugin/tests/api/resources/test_resources.py

@@ -12,9 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import json
-
 from oslo_log import log as logging
+from oslo_serialization import jsonutils
 from testtools import matchers
 
 from vitrage_tempest_plugin.tests.base import BaseVitrageTempest
@@ -172,7 +171,7 @@ class TestResource(BaseVitrageTempest):
                         'The resources taken from rest api is empty')
 
         sorted_cli_resources = sorted(
-            json.loads(cli_resources),
+            jsonutils.loads(cli_resources),
             key=lambda resource: resource["ID"])
         sorted_api_resources = sorted(
             api_resources,

vitrage_tempest_plugin/tests/common/aodh_utils.py

@@ -11,9 +11,12 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
-import json
+
 import random
 import time
+
+from oslo_serialization import jsonutils
+
 from vitrage_tempest_plugin.tests.common.constants import AodhProperties as \
     AodhProps
 from vitrage_tempest_plugin.tests.common.tempest_clients import TempestClients
@@ -125,7 +128,7 @@ def _aodh_request(type, resource_id=None, name=None, rule=None):
         # alarms, update accordingly
         query[0].update(dict(field='resource_id'))
         rule[AodhProps.RESOURCES_THRESHOLD_RULE].update(dict(
-            query=json.dumps(query)))
+            query=jsonutils.dump_as_bytes(query)))
 
     request.update(rule)
     return request

vitrage_tempest_plugin/tests/notifiers/test_mistral_notifier.py

@@ -12,10 +12,10 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import json
 import time
 
 from oslo_log import log as logging
+from oslo_serialization import jsonutils
 from testtools.matchers import HasLength
 
 from vitrage_tempest_plugin.tests.api.event.base import BaseTestEvents
@@ -140,7 +140,7 @@ class TestMistralNotifier(BaseTestEvents):
             # are at the end. Check the last `num_instances` executions.
             execution = \
                 self.mistral_client.executions.get(executions[-i].id)
-            execution_input = json.loads(execution.input)
+            execution_input = jsonutils.loads(execution.input)
             executed_on_instances.add(execution_input['farewell'])
 
         msg = "There are %d instances in the graph but only %d distinct " \
@@ -160,7 +160,7 @@ class TestMistralNotifier(BaseTestEvents):
                              'The last execution had no input')
         self.assertIn('farewell', execution_input_str,
                       'No \'farewell\' key in the last execution input')
-        execution_input = json.loads(execution_input_str)
+        execution_input = jsonutils.loads(execution_input_str)
         farewell_value = execution_input['farewell']
         self.assertIsNotNone(farewell_value, '\'farewell\' input parameter is '
                                              'None in last workflow execution')