datapaths: Improve port config
datapaths: Improve port config

1. Set STP-disable flag by default
2. Don't allow enabling of STP
3. All other port config flags are handled

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