Revert back to using an empty var as default to exclude hostname (#2110)

roles/kubernetes/node/defaults/main.yml

@@ -80,7 +80,6 @@ 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 -%}
-  false
   {%- else -%}
   {{ ansible_hostname }}
   {%- endif -%}

roles/kubernetes/node/templates/kubelet.kubeadm.env.j2

@@ -9,7 +9,7 @@ KUBELET_ADDRESS="--address={{ kubelet_bind_address }} --node-ip={{ kubelet_addre
 # The port for the info server to serve on
 # KUBELET_PORT="--port=10250"
 # You may leave this blank to use the actual hostname
-{% if kube_override_hostname|bool %}
+{% if kube_override_hostname|default('') %}
 KUBELET_HOSTNAME="--hostname-override={{ kube_override_hostname }}"
 {% endif %}
 {# Base kubelet args #}

roles/kubernetes/node/templates/kubelet.standard.env.j2

@@ -6,7 +6,7 @@ KUBELET_ADDRESS="--address={{ kubelet_bind_address }} --node-ip={{ kubelet_addre
 # The port for the info server to serve on
 # KUBELET_PORT="--port=10250"
 # You may leave this blank to use the actual hostname
-{% if kube_override_hostname|bool %}
+{% if kube_override_hostname|default('') %}
 KUBELET_HOSTNAME="--hostname-override={{ kube_override_hostname }}"
 {% endif %}
 {# Base kubelet args #}