Fix netchecker update side effect (#1644)

* Fix netchecker update side effect

kubectl apply should only be used on resources created
with kubectl apply. To workaround this, we should apply
the old manifest before upgrading it.

* Update 030_check-network.yml

tests/testcases/030_check-network.yml

@@ -16,7 +16,7 @@
     shell: "{{bin_dir}}/kubectl get pods --all-namespaces -owide"
     register: get_pods
 
-  - debug: msg="{{get_pods.stdout}}"
+  - debug: msg="{{get_pods.stdout.split('\n')}}"
 
   - name: Get pod names
     shell: "{{bin_dir}}/kubectl get pods -o json"