RFR(S): 8248882: SA PMap and PStack support on OSX works with core files. Enable them.

[Chris Plummer]

Hello,

Please help review the following:

https://bugs.openjdk.java.net/browse/JDK-8248882
http://cr.openjdk.java.net/~cjplummer/8248882/webrev.00/index.html

The changes enable PMap and PStack on OSX when debugging a core file. 
Unfortunately there appears to be no exposed way to determine if you are 
debugging a core file, so I had to rely on clues (certain lists being 
empty).

As part of these changes I'm adding core file testing to the two 
relevant tests. Also note that for ClhsdbPMap.java I had to tinker with 
the list of expected libraries in the output. For core files on Windows, 
the nio and net libraries were missing, presumably because nothing had 
triggered their loading yet, so I removed them from the expected output 
list, and add jli, which seems to always be there.

Also a minor change in CLHSB.java. It was sending a message to 
System.err. It makes the test output easier to read if it goes to 
System.out.

thanks,

Chris