RFR: 8000975: (process) Merge UNIXProcess.java.bsd & UNIXProcess.java.linux (& .solaris & .aix)

[Martin Buchholz]

I notice the ThreadGroup docs don't say "root thread group", they say
"system" or "initial".
If you could go ahead and fix my old use of root
s/root/system/g
that would be great.