Include os_client_config.admin_identity to core

This patch includes keystone.client.os_client_config.admin_identity to
keystone/client/core.yml to make sure os_client_config admin_identity
resources are created by default when core.yml is included
as they nedeed for queens.

Change-Id: Ib6197fb2ebd01ab32c703a7bfaa6fbf536766b92
diff --git a/keystone/client/core.yml b/keystone/client/core.yml
index f869059..899f4aa 100644
--- a/keystone/client/core.yml
+++ b/keystone/client/core.yml
@@ -1,3 +1,5 @@
+classes:
+- system.keystone.client.os_client_config.admin_identity
 parameters:
   _param:
     keystone_service_protocol: http