Fix duplicated iptables rules
Fix duplicated iptables rules

The `iptables.Exists` function is wrong in two ways:
1. The iptables -C call doesn't add `-j DOCKER` and fails to match
2. The long path takes ordering into account in comparison and fails to match

This patch fixes issue 1 by including `-j DOCKER` in the check.

Signed-off-by: Arnaud Porterie <55258e89a8b41a46066b3a9514b15a78c1a88d17@docker.com>

jvinod/libnetwork,tmakita/libnetwork,jimmycmh/libnetwork,tangkun75/libnetwork,calavera/libnetwork,clnperez/libnetwork,allencloud/libnetwork,AdoHe/libnetwork,mountkin/libnetwork,mahak/libnetwork,djones-skytap/libnetwork,YujiOshima/libnetwork,curtiszimmerman/libnetwork,amitkris/libnetwork,vdemeester/libnetwork,AdoHe/libnetwork,axsh/libnetwork,rogaha/libnetwork,cpuguy83/libnetwork,carlye566/libnetwork,fcrisciani/libnetwork,msagheer/libnetwork,frntn/libnetwork,mavenugo/libnetwork,anortef/libnetwork,abronan/libnetwork,abronan/libnetwork,tgraf/libnetwork,tgraf/libnetwork,hw-qiaolei/libnetwork,runcom/libnetwork,djones-skytap/libnetwork,tangkun75/libnetwork,pyakpyak/libnetwork,fcrisciani/libnetwork,docker/libnetwork,bprashanth/libnetwork,jvinod/libnetwork,msabansal/libnetwork,mYmNeo/libnetwork,jmzwcn/libnetwork,sanimej/libnetwork,ycaihua/libnetwork,mbanikazemi/libnetwork,kvasdopil/libnetwork,kvasdopil/libnetwork,sainath14/libnetwork,aboch/libnetwork_new,thockin/libnetwork,ityangchen/libnetwork,frntn/libnetwork,cloudflare/libnetwork,argvader/libnetwork,mapuri/libnetwork,brewertribe/libnetwork,chenchun/libnetwork,docker/libnetwork,cloudflare/libnetwork,rogaha/libnetwork,curtiszimmerman/libnetwork,kolyshkin/libnetwork,mahak/libnetwork,allencloud/libnetwork,amitkris/libnetwork,lindenlab/libnetwork,vijayendrabvs/libnetwork,WeiZhang555/libnetwork,medallia/libnetwork,hackersdotmu/libnetwork,carlye566/libnetwork,abhi/libnetwork,cpuguy83/libnetwork,brahmaroutu/libnetwork,clnperez/libnetwork,anarcher/libnetwork,wcwxyz/libnetwork,abhi/libnetwork,hw-qiaolei/libnetwork,kunalkushwaha/libnetwork,anshulr/libnetwork,medallia/libnetwork,aboch/libnetwork_new,junxu/libnetwork,lindenlab/libnetwork,sainath14/libnetwork,msabansal/libnetwork,hackersdotmu/libnetwork,runcom/libnetwork,thockin/libnetwork,mountkin/libnetwork,pyakpyak/libnetwork,vdemeester/libnetwork,carlye566/libnetwork_eric,sanimej/libnetwork,wcwxyz/libnetwork,dcbw/libnetwork,medallia/libnetwork,anortef/libnetwork,ityangchen/libnetwork,vijayendrabvs/libnetwork,ycaihua/libnetwork,minhoryang/libnetwork,mapuri/libnetwork,brewertribe/libnetwork,kolyshkin/libnetwork,docker/libnetwork,kolyshkin/libnetwork,mahak/libnetwork,YujiOshima/libnetwork,kunalkushwaha/libnetwork,coolljt0725/libnetwork,sharmasushant/libnetwork,chenchun/libnetwork,mYmNeo/libnetwork,junxu/libnetwork,bprashanth/libnetwork,axsh/libnetwork,jmzwcn/libnetwork,jimmycmh/libnetwork,wulonghui/libnetwork,vdemeester/libnetwork,anarcher/libnetwork,anshulr/libnetwork,mbanikazemi/libnetwork,brahmaroutu/libnetwork,coolljt0725/libnetwork,tmakita/libnetwork,sharmasushant/libnetwork,calavera/libnetwork,WeiZhang555/libnetwork,minhoryang/libnetwork,mavenugo/libnetwork,dcbw/libnetwork,argvader/libnetwork,carlye566/libnetwork_eric,msagheer/libnetwork,abhi/libnetwork,wulonghui/libnetwork