Add test for dns options
Add test for dns options

Validate that passing an option into the daemon config
does not corrupt the option set into the container resolv.conf

Signed-off-by: Flavio Crisciani <59eae1aa696b1b39cd87a38bdba3f0b2630647f9@docker.com>

kolyshkin/libnetwork,kolyshkin/libnetwork,abhi/libnetwork,docker/libnetwork,mahak/libnetwork,medallia/libnetwork,medallia/libnetwork,abhi/libnetwork,mahak/libnetwork,vdemeester/libnetwork,docker/libnetwork,vdemeester/libnetwork,medallia/libnetwork,docker/libnetwork,vdemeester/libnetwork,mahak/libnetwork,kolyshkin/libnetwork,abhi/libnetwork