Issue

• Shutdown is stalled in PeriodicRecovery.shutdown like so:

"MSC service thread 1-6" prio=10 tid=0x00007fea28002000 nid=0x141 in Object.wait() [0x00007fea88137000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000000e6cbb5a8> (a java.lang.Object)
    at java.lang.Object.wait(Object.java:503)
    at com.arjuna.ats.internal.arjuna.recovery.PeriodicRecovery.shutdown(PeriodicRecovery.java:189)
    - locked <0x00000000e6cbb5a8> (a java.lang.Object)
    at com.arjuna.ats.internal.arjuna.recovery.RecoveryManagerImple.stop(RecoveryManagerImple.java:177)
    at com.arjuna.ats.arjuna.recovery.RecoveryManager.terminate(RecoveryManager.java:208)
    - locked <0x00000000e6cbb4a8> (a com.arjuna.ats.arjuna.recovery.RecoveryManager)
    at com.arjuna.ats.arjuna.recovery.RecoveryManager.terminate(RecoveryManager.java:192)
    at com.arjuna.ats.jbossatx.jta.RecoveryManagerService.stop(RecoveryManagerService.java:73)
    at org.jboss.as.txn.service.ArjunaRecoveryManagerService.stop(ArjunaRecoveryManagerService.java:151)
    - locked <0x00000000e0935588> (a org.jboss.as.txn.service.ArjunaRecoveryManagerService)
    at org.jboss.msc.service.ServiceControllerImpl$StopTask.stopService(ServiceControllerImpl.java:2088)
    at org.jboss.msc.service.ServiceControllerImpl$StopTask.run(ServiceControllerImpl.java:2049)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)