Use a generated password for kube user (#1624)

Removed unnecessary root user

tests/testcases/010_check-apiserver.yml

@@ -2,10 +2,12 @@
 - hosts: kube-master
 
   tasks:
+  - debug:
+      msg: "kube pass: {{ lookup('password', '../../credentials/kube_user length=15') }}"
   - name: Check the API servers are responding
     uri:
       url: "https://{{ access_ip | default(ansible_default_ipv4.address) }}:{{ kube_apiserver_port }}/api/v1"
       user: kube
-      password: changeme
+      password: "{{ lookup('password', '../../credentials/kube_user length=15') }}"
       validate_certs: no
       status_code: 200