Add parameter for keystonev3 internal endpoint

We need to add "export OS_INTERFACE=internal" to keystonercv3

Change-Id: I6d313a59a8f17f40c7b60e1b7f2d1bbcb5430d1b
Closes-bug: PROD-9858
diff --git a/keystone/files/keystonercv3 b/keystone/files/keystonercv3
index c9deae7..ccb0d39 100644
--- a/keystone/files/keystonercv3
+++ b/keystone/files/keystonercv3
@@ -8,3 +8,4 @@
 export OS_USERNAME={{ server.admin_name }}
 export OS_PASSWORD={{ server.admin_password }}
 export OS_REGION_NAME={{ server.region }}
+export OS_INTERFACE=internal