Support SCTP port mapping

Signed-off-by: Wataru Ishida <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

Author: Wataru Ishida

vendor.conf

@@ -10,7 +10,7 @@ github.com/docker/docker-credential-helpers 3c90bd29a46b943b2a9842987b58fb91a7c1
 # the docker/go package contains a customized version of canonical/json
 # and is used by Notary. The package is periodically rebased on current Go versions.
 github.com/docker/go d30aec9fd63c35133f8f79c3412ad91a3b08be06
-github.com/docker/go-connections 98e7d807e5d804e4e42a98d74d1dd695321224ef
+github.com/docker/go-connections b75a8f5d9f362f674cc20668f2d9e96239cd4c72 https://github.com/ishidawataru/go-connections.git
 github.com/docker/go-events 9461782956ad83b30282bf90e31fa6a70c255ba9
 github.com/docker/go-units 9e638d38cf6977a37a8ea0078f3ee75a7cdb2dd1
 github.com/docker/swarmkit 713d79dc8799b33465c58ed120b870c52eb5eb4f
@@ -81,4 +81,3 @@ k8s.io/client-go kubernetes-1.8.2
 k8s.io/kubernetes v1.8.2
 k8s.io/kube-openapi 61b46af70dfed79c6d24530cd23b41440a7f22a5
 vbom.ml/util 928aaa586d7718c70f4090ddf83f2b34c16fdc8d
-