Fixes an issue where the access type is not defaulted

This issue occurs where a service already existed prior to the
introduction of the new access field for restrictions.  This fix
will default access to 'whitelist' where it did not exist before in
cassandra.

Change-Id: I972fc63db3ab290c5174b9969cfe993c12f5f48f

poppy/model/helpers/restriction.py

@@ -27,8 +27,6 @@ class Restriction(common.DictSerializableModel):
     """Restriction."""
 
     def __init__(self, name,
-                 # use r_type because type is
-                 # a python reserved word
                  access='whitelist', rules=[]):
         self._name = name
         self._access = access

poppy/storage/cassandra/services.py

@@ -645,7 +645,7 @@ class ServicesController(base.ServicesController):
 
         restrictions = [restriction.Restriction(
             r.get('name'),
-            r.get('access'),
+            r.get('access', 'whitelist'),
             [rule.Rule(r_rule.get('name'),
                        referrer=r_rule.get('referrer'),
                        client_ip=r_rule.get('client_ip'),