samples: Add mixed_switches demo
samples: Add mixed_switches demo

This little demo shows one way to load different components
for different switches.

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