Update iptable.Exists API in integration-cli
Update iptable.Exists API in integration-cli

Signed-off-by: Arko Dasgupta <5ace5199265f07060a7b6fe8a48858e91c7682a6@docker.com>

yosifkit/docker,cpuguy83/docker,paralin/docker,Ramzec/docker,gnailuy/docker,nawawi/docker,mahak/docker,moby/moby,mahak/docker,vdemeester/docker,bearstech/moby,paralin/docker,flavio/docker,Mokolea/docker,thaJeztah/docker,konstruktoid/docker-upstream,konstruktoid/docker-upstream,djs55/docker,jimjag/docker,mahak/docker,moby/moby,jameszhan/docker,moby/moby,jimjag/docker,jameszhan/docker,jimjag/docker,flavio/docker,justincormack/docker,gnailuy/docker,mahak/docker,cpuguy83/docker,nalind/docker,docker/docker,konstruktoid/docker-upstream,Ramzec/docker,nawawi/docker,trebonian/docker,jameszhan/docker,bearstech/moby,gnailuy/docker,nawawi/docker,thaJeztah/docker,cpuguy83/docker,jthelin/docker,Mokolea/docker,cpuguy83/docker,Mokolea/docker,yosifkit/docker,trebonian/docker,Ramzec/docker,nalind/docker,gnailuy/docker,yosifkit/docker,AkihiroSuda/docker,trebonian/docker,moby/moby,moul/docker,jthelin/docker,nalind/docker,justincormack/docker,nalind/docker,konstruktoid/docker-upstream,djs55/docker,jimjag/docker,docker/docker,docker/docker,bearstech/moby,vdemeester/docker,kojiromike/docker,moul/docker,AkihiroSuda/docker,paralin/docker,justincormack/docker,yosifkit/docker,Ramzec/docker,moul/docker,djs55/docker,trebonian/docker,moul/docker,flavio/docker,AkihiroSuda/docker,paralin/docker,AkihiroSuda/docker,thaJeztah/docker,vdemeester/docker,kojiromike/docker,Mokolea/docker,bearstech/moby,nawawi/docker,thaJeztah/docker,kojiromike/docker,flavio/docker