Fix 'no such host' problem (#2148)

Fix 'no such host' problem reported by commands *kubectl logs* and *kubectl exec*
when cloud_provider is OpenStack

Closes: #2147

roles/kubernetes/node/defaults/main.yml

@@ -81,7 +81,7 @@ kube_hyperkube_image_repo: ""
 
 # If non-empty, will use this string as identification instead of the actual hostname
 kube_override_hostname: >-
-  {%- if cloud_provider is defined -%}
+  {%- if cloud_provider is defined and cloud_provider in [ 'aws' ] -%}
   {%- else -%}
   {{ ansible_hostname }}
   {%- endif -%}