The change set of a55db97e8ce43aec9e2f3a3fe70f6bec3272195b,
change id of Ib740544ddbbb08745aa7f21aa9246acad1ad1d53
breaks ipv6 work around as follows.

> java.lang.IllegalArgumentException: Could not parse [2003:0:0:0:0:0:0:1/64]
> at org.apache.commons.net.util.SubnetUtils.calculate(SubnetUtils.java:240)[242:org.apache.commons.net:3.3.0]
> at org.apache.commons.net.util.SubnetUtils.<init>(SubnetUtils.java:52)[242:org.apache.commons.net:3.3.0]
> at org.opendaylight.ovsdb.openstack.netvirt.providers.openflow13.services.RoutingService.programRouterInterface(RoutingService.java:62)[279:org.opendaylight.ovsdb.opensta
ck.net-virt-providers:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.NeutronL3Adapter.programRouterInterfaceStage2(NeutronL3Adapter.java:1195)[278:org.opendaylight.ovsdb.openstack.net-virt:1
.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.NeutronL3Adapter.programRouterInterfaceStage1(NeutronL3Adapter.java:1183)[278:org.opendaylight.ovsdb.openstack.net-virt:1
.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.NeutronL3Adapter.programFlowForNetworkFromExternal(NeutronL3Adapter.java:1080)[278:org.opendaylight.ovsdb.openstack.net-v
irt:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.NeutronL3Adapter.programFlowsForNeutronRouterInterface(NeutronL3Adapter.java:1054)[278:org.opendaylight.ovsdb.openstack.n
et-virt:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.NeutronL3Adapter.handleNeutronRouterInterfaceEvent(NeutronL3Adapter.java:522)[278:org.opendaylight.ovsdb.openstack.net-vi
rt:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.NeutronL3Adapter.handleNeutronPortEvent(NeutronL3Adapter.java:483)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SN
APSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.NeutronL3Adapter.handleInterfaceEvent(NeutronL3Adapter.java:796)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAP
SHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.SouthboundHandler.handleInterfaceUpdate(SouthboundHandler.java:91)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAPSHO
T]
> at org.opendaylight.ovsdb.openstack.netvirt.SouthboundHandler.processPortUpdate(SouthboundHandler.java:299)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.SouthboundHandler.processPortEvent(SouthboundHandler.java:287)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.SouthboundHandler.processEvent(SouthboundHandler.java:232)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.EventDispatcherImpl.dispatchEvent(EventDispatcherImpl.java:95)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAPSH
OT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.EventDispatcherImpl.access$200(EventDispatcherImpl.java:27)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAPSHOT]
> at org.opendaylight.ovsdb.openstack.netvirt.impl.EventDispatcherImpl$1.run(EventDispatcherImpl.java:56)[278:org.opendaylight.ovsdb.openstack.net-virt:1.2.1.SNAPSHOT]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[:1.8.0_66]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)[:1.8.0_66]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_66]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_66]
> at java.lang.Thread.run(Thread.java:745)[:1.8.0_66]