CSIT Sporadic failures - DHCP failure due to missing ACL rules for VM lport

https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-newton-upstream-learn-carbon/210/archives/log.html.gz#s1-s1-s3

Might be related to this exception:
2017-04-07 04:17:33,144 | ERROR | eChangeHandler-0 | AsyncDataTreeChangeListenerBase | 298 - org.opendaylight.genius.mdsalutil-api - 0.2.0.SNAPSHOT | Thread terminated due to uncaught exception: AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-0
java.lang.NullPointerException
at org.opendaylight.netvirt.aclservice.AbstractAclServiceImpl.processInterfaceUpdate(AbstractAclServiceImpl.java:168)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.AbstractAclServiceImpl.updateAcl(AbstractAclServiceImpl.java:138)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.AclServiceManagerImpl.notify(AclServiceManagerImpl.java:57)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.listeners.AclInterfaceListener.update(AclInterfaceListener.java:102)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.aclservice.listeners.AclInterfaceListener.update(AclInterfaceListener.java:33)[349:org.opendaylight.netvirt.aclservice-impl:0.4.0.SNAPSHOT]
at org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:157)[298:org.opendaylight.genius.mdsalutil-api:0.2.0.SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_121]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]