openflow.topology: Revert to initializing Switch ids with their dpids
openflow.topology: Revert to initializing Switch ids with their dpids

Otherwise Discovery breaks (as it has no notion of IDs, and uses DPIDs),
and, in turn, the gui that uses Discovery's LinkEvents breaks, as it uses IDs
but Discovery advertises DIPDs

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