Force go 1.7.1 in circle.yml to resolve failure to get golint
Force go 1.7.1 in circle.yml to resolve failure to get golint

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

sainath14/libnetwork,abhi/libnetwork,mYmNeo/libnetwork,mbanikazemi/libnetwork,abhi/libnetwork,tmakita/libnetwork,vdemeester/libnetwork,medallia/libnetwork,ityangchen/libnetwork,mYmNeo/libnetwork,ityangchen/libnetwork,vdemeester/libnetwork,kolyshkin/libnetwork,WeiZhang555/libnetwork,docker/libnetwork,fcrisciani/libnetwork,mahak/libnetwork,curtiszimmerman/libnetwork,vdemeester/libnetwork,kolyshkin/libnetwork,mbanikazemi/libnetwork,docker/libnetwork,allencloud/libnetwork,medallia/libnetwork,abhi/libnetwork,kolyshkin/libnetwork,mahak/libnetwork,medallia/libnetwork,msabansal/libnetwork,allencloud/libnetwork,WeiZhang555/libnetwork,tmakita/libnetwork,sainath14/libnetwork,msabansal/libnetwork,mahak/libnetwork,curtiszimmerman/libnetwork,docker/libnetwork,fcrisciani/libnetwork