Add conntrack as dependency for kube{adm,let}

Addresses kubernetes/kubeadm#1287

Also associated with a PR in the k8s.io/kubernetes to keep the changes
in sync.

/cc @luxas @dims

Signed-off-by: Duffie Cooley <dcooley@heptio.com>

debian/build.go

@@ -292,6 +292,7 @@ func getKubeadmDependencies(v version) (string, error) {
 		"kubelet (>= 1.6.0)",
 		"kubectl (>= 1.6.0)",
 		fmt.Sprintf("kubernetes-cni (%s)", cniVersion),
+		"conntrack",
 		"${misc:Depends}",
 	}
 	sv, err := semver.Make(v.Version)

debian/xenial/kubelet/debian/control

@@ -10,6 +10,6 @@ Vcs-Browser: https://github.com/kubernetes/kubernetes
 
 Package: kubelet
 Architecture: {{ .DebArch }}
-Depends: iptables (>= 1.4.21), kubernetes-cni ({{ .KubeletCNIVersion }}), iproute2, socat, util-linux, mount, ebtables, ethtool, ${misc:Depends}
+Depends: iptables (>= 1.4.21), kubernetes-cni ({{ .KubeletCNIVersion }}), iproute2, socat, util-linux, mount, ebtables, ethtool, conntrack, ${misc:Depends}
 Description: Kubernetes Node Agent
  The node agent of Kubernetes, the container cluster manager

rpm/kubelet.spec

@@ -53,6 +53,7 @@ Requires: util-linux
 Requires: ethtool
 Requires: iproute
 Requires: ebtables
+Requires: conntrack
 
 
 %description
@@ -86,6 +87,7 @@ Requires: kubelet >= 1.6.0
 Requires: kubectl >= 1.6.0
 Requires: kubernetes-cni >= 0.6.0
 Requires: cri-tools >= 1.11.0
+Requires: conntrack
 
 %description -n kubeadm
 Command-line utility for administering a Kubernetes cluster.