RFR 8186539 [testlibrary] : TestSocketFactory should allow triggers before match/replace

[Roger Riggs]

Please review a rmi testlibrary enhancement to allow a trigger byte 
sequence before
the match and replace. It improves the ease with which stream contents 
can be identified
when streams contain IP addresses and sequence numbers that change from 
run to run.

Webrev:
http://cr.openjdk.java.net/~rriggs/webrev-socketfactory-trigger-8186539/
Thanks, Roger