RFR: JDK-8185003 JMX: Add a version of ThreadMXBean.dumpAllThreads with a maxDepth argument

[Ujwal Vangapally]

Hi,

kindly review the changes made.
https://bugs.openjdk.java.net/browse/JDK-8185003

webrev: 
http://cr.openjdk.java.net/~uvangapally/webrev/2017/8185003/webrev.00/

CSR: https://bugs.openjdk.java.net/browse/JDK-8185705

Thanks,

Ujwal.