Add subnet var in tests

tests/testcases/030_check-network.yml

@@ -34,6 +34,7 @@
     register: running_pods
 
   - set_fact:
+      kube_pods_subnet: 10.233.64.0/18
       pod_names: "{{ (pods.stdout | from_json)['items'] | map(attribute = 'metadata.name') | list }}"
       pod_ips: "{{ (pods.stdout | from_json)['items'] | selectattr('status.podIP', 'defined') | map(attribute = 'status.podIP') | list }}"
       pods_hostnet: |