packet: Change how TCP flags work
packet: Change how TCP flags work

TCP flags (e.g., SYN, FIN) are now boolean properties, and you don't
necessarily need to think about the actual bit math involved.  The old
constants are now suffixed with _flag (e.g., SYN_flag).

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