RFR: 8242295: Move files from vmTestbase/nsk/monitoring/ThreadMBean into ThreadMXBean

[Leonid Mesnik]

Hi
Could you please review following fix which just moves content of ThreadMBean back into ThreadMXBean. 

webrev: http://cr.openjdk.java.net/~lmesnik/8242295/webrev.00/ <http://cr.openjdk.java.net/~lmesnik/8242295/webrev.00/>
bug: https://bugs.openjdk.java.net/browse/JDK-8242295 <https://bugs.openjdk.java.net/browse/JDK-8242295>
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