openflow: Don't propagate halted events
openflow: Don't propagate halted events

If an event is halted when sourced on the OpenFlow nexus, don't
propagate it to the individual connection.

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