RFR (XS): 8005116: NPG: Rename -permstat option for jmap in jdk8 to -classstats

[Erik Helin]

Hi all,

this change is the second of three changes related to renaming the jmap
option permstat to clstats. The change has to be done as three separate
changes in order to not break any repositories:
1. Add support for the -clstats option to the SA agent
2. Change the tool jmap to use -clstats instead of -permstat
3. Remove the option -permstat from the SA agent

This CR represents the second step, which updates the jmap tool.

Step 1 and 3 are also out for review.

Webrev:
http://cr.openjdk.java.net/~ehelin/8005116/webrev.00/

Bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8005116

Thanks,
Erik