Support installing specific version of docker

Change-Id: I12015c28f6f8ffc125097a14514a6a90a20cf35b
(cherry picked from commit f8e786f0d5)

.gitreview

@@ -2,3 +2,4 @@
 host=review.opendev.org
 port=29418
 project=openstack/devstack-plugin-container.git
+defaultbranch=stable/yoga

devstack/lib/docker

@@ -73,7 +73,11 @@ function install_docker {
             ${dist_version} \
             stable"
         REPOS_UPDATED=False apt_get_update
-        apt_get install docker-ce
+        if [ -n "${UBUNTU_DOCKER_VERSION}" ]; then
+            apt_get install docker-ce=$UBUNTU_DOCKER_VERSION
+        else
+            apt_get install docker-ce
+        fi
     elif is_fedora; then
         if [[ "$lsb_dist" = "centos" ]]; then
             sudo yum-config-manager \

devstack/lib/k8s

@@ -63,6 +63,7 @@ function kubeadm_init {
     cat <<EOF | tee $kubeadm_config_file >/dev/null
 apiVersion: kubeadm.k8s.io/v1beta1
 kind: ClusterConfiguration
+imageRepository: "${KUBEADMIN_IMAGE_REPOSITORY}"
 etcd:
   external:
     endpoints:
@@ -84,6 +85,7 @@ apiVersion: kubelet.config.k8s.io/v1beta1
 kind: KubeletConfiguration
 failSwapOn: false
 EOF
+    sudo kubeadm config images pull --image-repository=${KUBEADMIN_IMAGE_REPOSITORY}
     sudo kubeadm init --config $kubeadm_config_file --ignore-preflight-errors Swap
 
     local kube_config_file=$HOME/.kube/config

devstack/settings

@@ -14,6 +14,8 @@ CRIO_ALLOW_ICMP=${CRIO_ALLOW_ICMP:-true}
 CNI_CONF_DIR=${CNI_CONF_DIR:-}
 CNI_PLUGIN_DIR=${CNI_PLUGIN_DIR:-}
 
+UBUNTU_DOCKER_VERSION=${UBUNTU_DOCKER_VERSION:-}
+
 # Enable container services
 enable_service container
 
@@ -24,3 +26,6 @@ if [[ ,${ENABLED_SERVICES} =~ ,"k8s-master" ]]; then
     enable_service kube-scheduler
     enable_service kube-proxy
 fi
+
+# Customize kubeadm container images repository
+KUBEADMIN_IMAGE_REPOSITORY=${KUBEADMIN_IMAGE_REPOSITORY:-"k8s.gcr.io"}