[8u20] request for approval - 8034944: (process) Improve subprocess handling on Solaris

[Rob McKenna]

This one is a "new" fix for 8u20:

Bug: https://bugs.openjdk.java.net/browse/JDK-8034944
Review: 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-March/025940.html

(note, the review thread was rerouted for the sake of new work in 9, but 
there are approvals in there from Martin & Alan. I'd like to get this 
change into 8)

     -Rob