topology.py: Start ID generation at 1 instead of 0
topology.py: Start ID generation at 1 instead of 0

There was an inconsistency between the IDs here and the ones reported by
LinkEvents. I'm not sure this is the correct fix, the inconsistency is probably
due to something deeper.

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