also use kube_api_pwd for root account

This makes it a bit more secure. Also the password can now be changed with a (inventory) variable (no need to edit all.yml).

inventory/group_vars/all.yml

@@ -55,7 +55,7 @@ kube_users:
     pass: "{{kube_api_pwd}}"
     role: admin
   root:
-    pass: "changeme"
+    pass: "{{kube_api_pwd}}"
     role: admin
 
 # Kubernetes cluster name, also will be used as DNS domain