Kill states associated with the old WAN IP when WAN IP has changed. Retain
hidden config option to wipe all states on IP change, as there seemed to
be circumstances where the 'pfctl -k $oldip' didn't suffice for others
(much of history in redmine ticket, some on forum and elsewhere). ticket
Fix two more instances of rrd.tgz renaming.
Merge remote-tracking branch 'upstream/master'