Below comes out during 3node testing. At some point after ODL1 is taken down and brought back into service and tests continue, these logs start coming our repeatedly.

https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-3node-openstack-ocata-upstream-stateful-carbon/184/odl_1/odl1_err_warn_exception.log.gz

2017-11-20 03:48:58,989 | WARN | entLoopGroup-8-1 | DeviceContextImpl | 281 - org.opendaylight.openflowplugin.impl - 0.4.3.SNAPSHOT | writePortStatusMessage
2017-11-20 03:48:58,990 | WARN | entLoopGroup-8-1 | DeviceContextImpl | 281 - org.opendaylight.openflowplugin.impl - 0.4.3.SNAPSHOT | submit transaction for write port status message
2017-11-20 03:48:59,018 | WARN | entLoopGroup-8-1 | DeviceContextImpl | 281 - org.opendaylight.openflowplugin.impl - 0.4.3.SNAPSHOT | writePortStatusMessage
2017-11-20 03:48:59,019 | WARN | entLoopGroup-8-1 | DeviceContextImpl | 281 - org.opendaylight.openflowplugin.impl - 0.4.3.SNAPSHOT | submit transaction for write port status message
2017-11-20 03:48:59,980 | WARN | entLoopGroup-8-1 | DeviceContextImpl | 281 - org.opendaylight.openflowplugin.impl - 0.4.3.SNAPSHOT | writePortStatusMessage
2017-11-20 03:48:59,980 | WARN | entLoopGroup-8-1 | DeviceContextImpl | 281 - org.opendaylight.openflowplugin.impl - 0.4.3.SNAPSHOT | submit transaction for write port status message