Transaction leak in NatInterfaceStateChangeListener

  DataBroker : newWriteOnlyTransaction()
    2602x transactions opened here, which are not closed:
      (...)
      org.opendaylight.controller.md.sal.binding.impl.BindingDOMDataBrokerAdapter.newWriteOnlyTransaction(BindingDOMDataBrokerAdapter.java:69)
      (...)
      org.opendaylight.netvirt.natservice.internal.NatInterfaceStateChangeListener$NatInterfaceStateUpdateWorker.call(NatInterfaceStateChangeListener.java:377)
      org.opendaylight.netvirt.natservice.internal.NatInterfaceStateChangeListener$NatInterfaceStateUpdateWorker.call(NatInterfaceStateChangeListener.java:356)
      org.opendaylight.infrautils.jobcoordinator.internal.JobCoordinatorImpl$MainTask.runWithUncheckedExceptionLogging(JobCoordinatorImpl.java:416)
      org.opendaylight.infrautils.utils.concurrent.LoggingUncaughtThreadDeathContextRunnable.run(LoggingUncaughtThreadDeathContextRunnable.java:60)
      java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
      java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
      java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
      java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
      java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)