RFR [9] 8147553: Remove sun.misc.ManagedLocalsThread from java.management

[Chris Hegarty]

8056152 added a new constructor to java.lang.Thread to constructing
Threads that do not  inherit inheritable-thread-local initial values.
Given there is now a supported API for creating such threads, other 
areas of the JDK should be updated to use it.

This change updates the code in java.management to use the new Thread 
constructor.

http://cr.openjdk.java.net/~chegar/8147553/
https://bugs.openjdk.java.net/browse/JDK-8147553

-Chris.