samples: Add pretty_log sample
samples: Add pretty_log sample

This is pretty much the log configuration I generally use.

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