Remove rest of MPLS
Remove rest of MPLS

This removes some MPLS stuff from the software switch and
the libopenflow tests.

Again, if we want to add this back in, I think we can do it
as subclasses/additions.

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