openflow: Fix bug in BarrierIn event
openflow: Fix bug in BarrierIn event

This had a bug from when ofp classes were made to inherit ofp_header rather
than aggregate it.

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