pxpcap: Attempt to fix some bitrot
pxpcap: Attempt to fix some bitrot

This hadn't been updated for (not so) recent changes in the packet
library.  It may now work again.

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