Few of test/java/lang/management/ThreadMXBean/* tests don't clean up the created threads

This test leaves a number of threads behind when run in samevm or agentvm mode. These threads should terminate at the end of the test or alternative be changed to run in othervm mode.

"Thread-3109" #4912 daemon prio=5 os_prio=0 tid=0x26186000 nid=0x206c waiting on condition [0x2a0bf000]
   java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x107ea108> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2038)
at SynchronizerLockingThread$Thread2.run(SynchronizerLockingThread.java:348)

"Thread-3108" #4911 daemon prio=5 os_prio=0 tid=0x26182c00 nid=0x1a6c in Object.wait() [0x2587f000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at SynchronizerLockingThread$Thread1.D(SynchronizerLockingThread.java:296)
- locked <0x107ea120> (a SynchronizerLockingThread$Lock)
at SynchronizerLockingThread$Thread1.C(SynchronizerLockingThread.java:288)
- locked <0x107ea1c8> (a SynchronizerLockingThread$Lock)
at SynchronizerLockingThread$Thread1.B(SynchronizerLockingThread.java:280)
- locked <0x107ea1d8> (a SynchronizerLockingThread$Lock)
at SynchronizerLockingThread$Thread1.A(SynchronizerLockingThread.java:265)
at SynchronizerLockingThread$Thread1.run(SynchronizerLockingThread.java:256)