pxpcap: Improve pcap_next_ex() (C++ side)
pxpcap: Improve pcap_next_ex() (C++ side)

* Allows to capture bytearrays (already done for loop/dispatch)
* Fix a potential bug when captures fail
* Adds option to *not* release the GIL

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