8154985: Add the ability to use main class as lookup (as jcmd) to jinfo, jmap, jstack

[Robbin Ehn]

Hi all,

Please review this enhancement for jinfo, jstack and jmap.

It is based on top of "8155091: Remove SA related functions from tmtools"
http://mail.openjdk.java.net/pipermail/serviceability-dev/2016-May/019609.html
Version 5 which is reviewed but not yet pushed:
http://cr.openjdk.java.net/~dsamersoff/JDK-8155091/webrev.05/

Bug: https://bugs.openjdk.java.net/browse/JDK-8154985
Webrev: http://cr.openjdk.java.net/~rehn/8154985/webrev/

Passes jdk/test/sun/tools/
(or 1 test fails locally, but that tests also fails in vanilla)
And manual testing.

Thanks!

/Robbin