Bump Go to 1.9.3
Bump Go to 1.9.3

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

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