Add hacking checks to watcher

The hacking checks enforce during the pep8 run functional validations of
the code to ensure deeper filters and code consistency.  This change set
adds the hacking checks to the wathcer project.  These checks were
seeded from the neutron project, which had a good set of base defaults.

This change set also updates the watcher project to be compliant with
these new hacking checks.

Change-Id: I6f4566d384a7400bddf228aa127a53e6ecc82c2e

watcher/api/controllers/v1/types.py

@@ -15,7 +15,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import json
+from oslo_serialization import jsonutils
 from oslo_utils import strutils
 import six
 import wsme
@@ -118,7 +118,7 @@ class JsonType(wtypes.UserType):
     @staticmethod
     def validate(value):
         try:
-            json.dumps(value)
+            jsonutils.dumps(value, default=None)
         except TypeError:
             raise exception.Invalid(_('%s is not JSON serializable') % value)
         else: