Fix wrong ip for keystone service on analytic nodes

OC3 contrail-snmp-collector service gets wrong ip for keystone
service and it is not able to authorize: as a result it
gets stuck in infinite initializing state

Change-Id: I7b46da4c85cdca7fbc215a5ed560be1b55feb3cb
Related-bug: PROD-24631
diff --git a/opencontrail/control/analytics.yml b/opencontrail/control/analytics.yml
index 36781c2..7471997 100644
--- a/opencontrail/control/analytics.yml
+++ b/opencontrail/control/analytics.yml
@@ -36,6 +36,8 @@
       role: ${_param:opencontrail_node_role}
       discovery:
         host: ${_param:opencontrail_control_address}
+      identity:
+        host: ${_param:openstack_control_address}
     database:
       discovery:
         host: ${_param:opencontrail_control_address}