packet: Fix to DHCP
packet: Fix to DHCP

Building DHCP options wasn't working

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