packet: Backing out accidental changes from r344
packet: Backing out accidental changes from r344

r344 Was supposed to just fix a minor bug in openflow.py, but a number
of significant changes to dhcp.py got lumped in by accident.  This
rolls those back so that they can be properly entered.

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