packet: Halfhearted attempt to fix up DNS packing
packet: Halfhearted attempt to fix up DNS packing

I think this actually needs a fair amount of work, but this is a
quick stab which at least sort of fixes some stuff?  Please file
issues with traces that elicit bad behavior.

carlye566/IoT-POX,denovogroup/pox,waltznetworks/pox,kpengboy/pox-exercise,kpengboy/pox-exercise,noxrepo/pox,andiwundsam/_of_normalize,diogommartins/pox,carlye566/IoT-POX,chenyuntc/pox,kulawczukmarcin/mypox,adusia/pox,jacobq/csci5221-viro-project,chenyuntc/pox,waltznetworks/pox,MurphyMc/pox,kulawczukmarcin/mypox,adusia/pox,VamsikrishnaNallabothu/pox,denovogroup/pox,adusia/pox,kpengboy/pox-exercise,waltznetworks/pox,denovogroup/pox,adusia/pox,xAKLx/pox,MurphyMc/pox,xAKLx/pox,MurphyMc/pox,PrincetonUniversity/pox,diogommartins/pox,jacobq/csci5221-viro-project,carlye566/IoT-POX,jacobq/csci5221-viro-project,kpengboy/pox-exercise,pthien92/sdn,kavitshah8/SDNDeveloper,noxrepo/pox,diogommartins/pox,jacobq/csci5221-viro-project,chenyuntc/pox,denovogroup/pox,diogommartins/pox,pthien92/sdn,noxrepo/pox,andiwundsam/_of_normalize,VamsikrishnaNallabothu/pox,jacobq/csci5221-viro-project,kulawczukmarcin/mypox,waltznetworks/pox,carlye566/IoT-POX,PrincetonUniversity/pox,andiwundsam/_of_normalize,noxrepo/pox,kavitshah8/SDNDeveloper,PrincetonUniversity/pox,VamsikrishnaNallabothu/pox,pthien92/sdn,VamsikrishnaNallabothu/pox,kavitshah8/SDNDeveloper,xAKLx/pox,waltznetworks/pox,kulawczukmarcin/mypox,kulawczukmarcin/mypox,andiwundsam/_of_normalize,PrincetonUniversity/pox,pthien92/sdn,VamsikrishnaNallabothu/pox,carlye566/IoT-POX,xAKLx/pox,kavitshah8/SDNDeveloper,adusia/pox,diogommartins/pox,chenyuntc/pox,MurphyMc/pox,xAKLx/pox,MurphyMc/pox,PrincetonUniversity/pox,pthien92/sdn,denovogroup/pox,kpengboy/pox-exercise,chenyuntc/pox