pretty_log: Allow log level parameters
pretty_log: Allow log level parameters

You can now pass the same parameters to samples.pretty_log as for
log.level -- it just passes them along.  This is just an attempt to be
a bit more convenient.

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