RFR (XS): 7126732: MAC: Require Mac OS X builds/tests for JPRT integrate jobs for HotSpot

[James Melvin]

Greetings,

We're ready to require HotSpot builds on Mac OS X for JPRT integrate
jobs. There are 3 mac-minis in each queue. Build/Test times are short
relative to other platforms. Uses the stable Linux testlist for now.

http://cr.openjdk.java.net/~jmelvin/7126732/webrev.00

Tested with *several* JPRT submissions for other bugfixes. I'd like to
integrate this change right after the current snapshot window.

Feedback welcome.

Thanks,

Jim