Added RemoteGetStressTest (https://issues.jboss.org/browse/JGRP-1675)

Changed OOB thread pool min/max threads plus timeout

Returning Dan's BigObject impl instead of byte[] buffer

Sending GET to 3 members

Sending CREDIT_REQUEST as OOB | INTERNAL (https://issues.jboss.org/browse/JGRP-1675)
Merge branch 'master' of github.com:belaban/JGroups