Use jsonutils from oslo.serialization

Rather than sync'ing with oslo-incubator, let's use the library
oslo.serialization instead.
We can't remove jsonutils under keystone/openstack/common/
because it's still used by other common functions.

Change-Id: Ic3e8d621616dd1cf14ac1446405896f2dc61288b

keystone/contrib/oauth1/backends/sql.py

@@ -16,6 +16,7 @@ import datetime
 import random
 import uuid
 
+from oslo.serialization import jsonutils
 from oslo.utils import timeutils
 import six
 
@@ -23,7 +24,6 @@ from keystone.common import sql
 from keystone.contrib.oauth1 import core
 from keystone import exception
 from keystone.i18n import _
-from keystone.openstack.common import jsonutils
 
 
 class Consumer(sql.ModelBase, sql.DictBase):

keystone/contrib/oauth1/controllers.py

@@ -14,6 +14,7 @@
 
 """Extensions supporting OAuth1."""
 
+from oslo.serialization import jsonutils
 from oslo.utils import timeutils
 
 from keystone.common import controller
@@ -26,7 +27,6 @@ from keystone import exception
 from keystone.i18n import _
 from keystone.models import token_model
 from keystone import notifications
-from keystone.openstack.common import jsonutils
 
 
 CONF = config.CONF