Add 'is_admin_project' attribute in token

In mitaka, keystone supports is_admin_project attribute.
https://blueprints.launchpad.net/keystone/+spec/is-admin-project
This patch will support this attribute.

Change-Id: I1531019d55eaa752f1560092a376bc19be6f3db2
Closes-Bug: #1602528

openstack_auth/user.py

@@ -101,6 +101,8 @@ class Token(object):
         project = {}
         project['id'] = auth_ref.project_id
         project['name'] = auth_ref.project_name
+        project['is_admin_project'] = getattr(auth_ref, 'is_admin_project',
+                                              False)
         self.project = project
         self.tenant = self.project