New thread introduced by hbase-900 part 4 is not daemon so can cause JVM to 
stick around on abort
-------------------------------------------------------------------------------------------------

                 Key: HBASE-1074
                 URL: https://issues.apache.org/jira/browse/HBASE-1074
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack
             Fix For: 0.19.0




{code}
"pool-1-thread-1" prio=10 tid=0x00007f582805c800 nid=0x6fd waiting on condition 
[0x00000000436a7000..0x00000000436a7c00]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00007f583b3578e0> (a 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
        at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
        at java.util.concurrent.DelayQueue.take(DelayQueue.java:160)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:583)
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:576)
        at 
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)
{code}

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