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/db/sqlalchemy/models.py

@@ -16,11 +16,10 @@
 SQLAlchemy models for watcher service
 """
 
-import json
-
 from oslo_config import cfg
 from oslo_db import options as db_options
 from oslo_db.sqlalchemy import models
+from oslo_serialization import jsonutils
 import six.moves.urllib.parse as urlparse
 from sqlalchemy import Column
 from sqlalchemy import DateTime
@@ -70,12 +69,12 @@ class JsonEncodedType(TypeDecorator):
                             % (self.__class__.__name__,
                                self.type.__name__,
                                type(value).__name__))
-        serialized_value = json.dumps(value)
+        serialized_value = jsonutils.dumps(value)
         return serialized_value
 
     def process_result_value(self, value, dialect):
         if value is not None:
-            value = json.loads(value)
+            value = jsonutils.loads(value)
         return value