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

[Erik Gahlin]

Looks good, not a reviewer.

Nit, saw that spaces before commas were missing in some method calls, 
i.e. ",-1" instead of ", -1"

Erik

> 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.
>