lib: Add docstrings for util
lib: Add docstrings for util

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