RFR(s): 8224600: Provide VM.events command

[Thomas Stüfe]

Hi all,

May I please have reviews for the following addition to jcmd.

Bug: https://bugs.openjdk.java.net/browse/JDK-8224600
CSR: https://bugs.openjdk.java.net/browse/JDK-8224601
webrev:
http://cr.openjdk.java.net/~stuefe/webrevs/vm.events/webrev.00/webrev/index.html

This adds a new command, "VM.events", which can be used to display VM event
logs. Please see linked CSR for details.

The CSR itself is not yet approved but already in proposed state.

Thanks, Thomas