Externalgateway Mac address keeps on try to resolve,after cleared the GW on Openstack externalNetwork

Build#: Lithium-SR1 Build
Openstack: stable/kilo

local.conf snip
=======
enable_plugin networking-odl https://github.com/stackforge/networking-odl stable/kilo
Q_PLUGIN=ml2
ENABLE_TENANT_TUNNELS=True
Q_ML2_TENANT_NETWORK_TYPE=vxlan
PUBLIC_INTERFACE=em3
ODL_LOCAL_IP=20.1.1.3
disable_service q-l3
Q_L3_ENABLED=True
ODL_L3=True

ODL custom.properites
================
ovsdb.l3.fwd.enabled=yes
ovsdb.l3gateway.mac=00:00:5E:00:02:01 (tested with both enable/disabled option)

Environment
============
Openstack controller & compute node connected with ODL as external mode.

Problem:
==========
When External Network Gateway has been cleared from openstack side,ODL logs keeps on throwning errors as
====================SNIP======================
2015-09-01 17:49:01,583 | ERROR | pool-55-thread-1 | GatewayMacResolverService | 285 - org.opendaylight.ovsdb.openstack.net-virt-providers - 1.1.1.Lithium-SR1 | MAC address for gateway 5.1.1.1 can not be resolved, because external bridge 52239137539 is not connected to controller.

==================SNIP==============================

Steps to Reproduce:
==================
1.Create the external network with subnet 5.1.1.0/24
2.On Tenant network,create Router and assign the External Network as Gateway.You can see ODL log with discovery of Gateway
3.Clear the Network Gateway from Router (step-2 created router).
4.ODL log keeps thrown the gateway cannot be resolved