of_json: Filter wildcarded IPs in dict conversion
of_json: Filter wildcarded IPs in dict conversion

Entirely wildcarded IPs were showing up in the dict conversion.
Now they don't, which is consistent with the rest of the fields.

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