software_switch.py: removing Excpetion on bring_port_up()
software_switch.py: removing Excpetion on bring_port_up()

might be called to add a brand new port (e.g. VM migration)

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