RFR: JDK-8178508 Co-locate remaining MM tests

[Ujwal Vangapally]

Kindly review the changes made for below bug

converted tonga test to JTREG test

added an additional assert statement for verifying setusageThreshold() 
operation is successful

https://bugs.openjdk.java.net/browse/JDK-8178508

tonga test case is currently at this path :

http://sqe-hgi.us.oracle.com/hg/index.cgi/testbase/javase/functional/9/vm/file/tip/src/nsk/regression/b6653214/  


webrev :
http://cr.openjdk.java.net/~uvangapally/webrev/2017/8178508/webrev.00/

Thanks,

Ujwal.

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