RFR (S): 8004172: Update jstat counter names to reflect metaspace changes

[Erik Helin]

Hi all,

here are the HotSpot changes for fixing JDK-8004172. This change uses 
the new namespace "sun.gc.metaspace" for the metaspace counters and also 
removes some code from metaspaceCounters.hpp/cpp that is not needed any 
longer.

Note that the tests will continue to fail until the JDK part of the 
change finds it way into the hotspot-gc forest.

The JDK part of the change is also out for review on 
serviceability-dev at openjdk.java.net.

Webrev:
HotSpot: http://cr.openjdk.java.net/~ehelin/8004172/hotspot/webrev.00/
JDK: http://cr.openjdk.java.net/~ehelin/8004172/jdk/webrev.00/

Bug:
http://bugs.sun.com/view_bug.do?bug_id=8004172

Testing:
Run the jstat jtreg tests locally on my machine on a repository where 
I've applied both the JDK changes and the HotSpot changes.

Thanks,
Erik