Properly construct CIDR in policy selector
Properly construct CIDR in policy selector

- Current code programs src/dst cidr like 192.168.100.126/128

Signed-off-by: Alessandro Boch <5bd2eb5b6f60921d9a2b9cb6a0a86bb947f3d361@docker.com>

fcrisciani/libnetwork,vdemeester/libnetwork,docker/libnetwork,allencloud/libnetwork,mahak/libnetwork,WeiZhang555/libnetwork,vdemeester/libnetwork,mahak/libnetwork,docker/libnetwork,abhi/libnetwork,abhi/libnetwork,abhi/libnetwork,allencloud/libnetwork,docker/libnetwork,kolyshkin/libnetwork,kolyshkin/libnetwork,mahak/libnetwork,tmakita/libnetwork,ityangchen/libnetwork,medallia/libnetwork,tmakita/libnetwork,medallia/libnetwork,ityangchen/libnetwork,WeiZhang555/libnetwork,medallia/libnetwork,kolyshkin/libnetwork,fcrisciani/libnetwork,vdemeester/libnetwork