packet: Remove unused packet_exceptions.py
packet: Remove unused packet_exceptions.py

Can always add it back again later if we need it for some reason...

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