Add support for Kubernetes 1.9.11 (#3934)

See https://github.com/kubernetes/kubernetes/releases/tag/v1.9.11

packer/install-dependencies.sh

@@ -118,7 +118,7 @@ done
 pullContainerImage "docker" "busybox"
 
 # TODO: fetch supported k8s versions from an acs-engine command instead of hardcoding them here
-K8S_VERSIONS="1.7.15 1.7.16 1.8.14 1.8.15 1.9.9 1.9.10 1.10.7 1.10.8 1.11.2 1.11.3"
+K8S_VERSIONS="1.7.15 1.7.16 1.8.14 1.8.15 1.9.10 1.9.11 1.10.7 1.10.8 1.11.2 1.11.3"
 
 for KUBERNETES_VERSION in ${K8S_VERSIONS}; do
     HYPERKUBE_URL="k8s.gcr.io/hyperkube-amd64:v${KUBERNETES_VERSION}"

pkg/api/common/versions.go

@@ -52,8 +52,9 @@ var AllKubernetesSupportedVersions = map[string]bool{
 	"1.9.6":          false,
 	"1.9.7":          false,
 	"1.9.8":          false,
-	"1.9.9":          true,
+	"1.9.9":          false,
 	"1.9.10":         true,
+	"1.9.11":         true,
 	"1.10.0-beta.2":  false,
 	"1.10.0-beta.4":  false,
 	"1.10.0-rc.1":    false,