of_01: Coalesce connection aborted messages
of_01: Coalesce connection aborted messages

A recent commit made these happen at debug level instead of info.  We now
coalesce them into chunks of 20 seconds too.  There's some information
loss here, but I think it's acceptable.

MurphyMc/pox,pthien92/sdn,noxrepo/pox,pthien92/sdn,pthien92/sdn,MurphyMc/pox,MurphyMc/pox,MurphyMc/pox,noxrepo/pox,pthien92/sdn,noxrepo/pox,pthien92/sdn,noxrepo/pox,MurphyMc/pox