Simplify handling of per-network waitingJoins
Simplify handling of per-network waitingJoins

Signed-off-by: James McCoy <91ae71a1168cea0b65ac9975da69d5a7753116be@users.sourceforge.net>

Ban3/Limnoria,frumiousbandersnatch/supybot-code,Ban3/Limnoria,jeffmahoney/supybot,raboof/supybot,ProgVal/Limnoria-test,buildbot/supybot,haxwithaxe/supybot,ProgVal/Limnoria-test