Use common db model class from Oslo

Modified DictBase class - added common `models.ModelBase` class as
base class instead of object and removed duplicated code.
Added new oslo.config version to requirements.

blueprint use-common-oslo-db-code

Change-Id: Ib1b8883d878a1c95d04dfab05bfe87ce37d0d6cb

keystone/common/sql/core.py

@@ -28,6 +28,7 @@ from sqlalchemy import types as sql_types
 
 from keystone import config
 from keystone import exception
+from keystone.openstack.common.db.sqlalchemy import models
 from keystone.openstack.common import jsonutils
 from keystone.openstack.common import log as logging
 
@@ -149,7 +150,7 @@ class JsonBlob(sql_types.TypeDecorator):
         return jsonutils.loads(value)
 
 
-class DictBase(object):
+class DictBase(models.ModelBase):
     attributes = []
 
     @classmethod
@@ -178,43 +179,11 @@ class DictBase(object):
 
         return d
 
-    def __setitem__(self, key, value):
-        setattr(self, key, value)
-
     def __getitem__(self, key):
         if key in self.extra:
             return self.extra[key]
         return getattr(self, key)
 
-    def get(self, key, default=None):
-        return getattr(self, key, default)
-
-    def __iter__(self):
-        self._i = iter(sqlalchemy.orm.object_mapper(self).columns)
-        return self
-
-    def next(self):
-        n = self._i.next().name
-        return n
-
-    def update(self, values):
-        """Make the model object behave like a dict."""
-        for k, v in values.iteritems():
-            setattr(self, k, v)
-
-    def iteritems(self):
-        """Make the model object behave like a dict.
-
-        Includes attributes from joins.
-
-        """
-        return dict([(k, getattr(self, k)) for k in self])
-        #local = dict(self)
-        #joined = dict([(k, v) for k, v in self.__dict__.iteritems()
-        #               if not k[0] == '_'])
-        #local.update(joined)
-        #return local.iteritems()
-
 
 def mysql_on_checkout(dbapi_conn, connection_rec, connection_proxy):
     """Ensures that MySQL connections checked out of the pool are alive.

requirements.txt

@@ -15,7 +15,8 @@ passlib
 lxml
 iso8601>=0.1.4
 python-keystoneclient>=0.3.0
-oslo.config>=1.1.0
+-f http://tarballs.openstack.org/oslo.config/oslo.config-1.2.0a3.tar.gz#egg=oslo.config-1.2.0a3
+oslo.config>=1.2.0a3
 Babel>=0.9.6
 oauth2
 dogpile.cache>=0.5.0