Support k8s networking upgrade based on k8s version

Update to support a set of k8s networking templates
based on kubernetes release. The kubernetes version
needs to be passed to the ansible playbook
k8s-networking-upgrade.yml to determine which set
of networking manifests should be applied for the
current kubernetes.

Story: 2006781
Task: 37584
Change-Id: I3a0b9f56608ddb1323b36f9ecedb8a5488c222c9
Signed-off-by: Angie Wang <angie.wang@windriver.com>

playbookconfig/src/playbooks/roles/common/push-docker-images/tasks/main.yml

@@ -37,7 +37,8 @@
   - set_fact:
       kubernetes_version: "{{ lookup('file', 'roles/common/files/kubeadm.yaml.erb') |
         regex_search('^kubernetesVersion: (.*)$', multiline=True) | regex_replace('^(.*): (.*)$', '\\2')}}"
-  when: upgrade_kubernetes is not defined
+  when: (upgrade_kubernetes is not defined and
+         upgrade_k8s_networking is not defined)
 
 - name: Get the list of kubernetes images
   shell: "kubeadm config images list --kubernetes-version {{ kubernetes_version }}"
@@ -47,6 +48,10 @@
 - set_fact:
     kubernetes_images: "{{ kubernetes_images_output.stdout_lines }}"
 
+- include_vars:
+    dir: "vars/k8s-{{ kubernetes_version }}"
+    files_matching: "system-images.yml"
+
 - name: Get the list of platform images
   set_fact:
     networking_images: