MULT: Fix RSYSLOG_IP problems

Nova_rsyslog_helper was doing the return codes incorrectly; even when 
properly completing, it would report an error. Fixed that. Added 
RSYSLOG_IP function to the Config class and file, to allow persistence 
between active sessions. Got rid of variable within FeatureSet.cpp that was
throwing compiler warnings because it was being instantiated but not used.
Fixed the reguler expression within main.js for RSYSLOG_IP to disallow
single IP addresses, as well as pretty much anything else that wasn't an
IP:PORT combination.