Remove kubelet_node_{custom_flags,config_extra_args}

There is no need to have an extra variables for this, just use different
values per host (using Ansible group_vars, for example)

docs/vars.md

@@ -295,14 +295,10 @@ kubelet_config_extra_args:
 The possible vars are:
 
 * *kubelet_config_extra_args*
-* *kubelet_node_config_extra_args*
 
 Previously, the same parameters could be passed as flags to kubelet binary with the following vars:
 
 * *kubelet_custom_flags*
-* *kubelet_node_custom_flags*
-
-The `kubelet_node_custom_flags` apply kubelet settings only to nodes and not control planes. Example:
 
 ```yml
 kubelet_custom_flags:

roles/kubernetes/node/defaults/main.yml

@@ -124,9 +124,6 @@ kubelet_config_extra_args_cgroupfs:
   systemCgroups: /system.slice
   cgroupRoot: /
 
-## Support parameters to be passed to kubelet via kubelet-config.yaml only on nodes, not masters
-kubelet_node_config_extra_args: {}
-
 # Maximum number of container log files that can be present for a container.
 kubelet_logfiles_max_nr: 5
 
@@ -136,9 +133,6 @@ kubelet_logfiles_max_size: 10Mi
 ## Support custom flags to be passed to kubelet
 kubelet_custom_flags: []
 
-## Support custom flags to be passed to kubelet only on nodes, not masters
-kubelet_node_custom_flags: []
-
 # If non-empty, will use this string as identification instead of the actual hostname
 kube_override_hostname: >-
   {%- if cloud_provider is defined and cloud_provider in ['aws'] -%}

roles/kubernetes/node/templates/kubelet-config.v1beta1.yaml.j2

@@ -77,9 +77,6 @@ resolvConf: "{{ kube_resolv_conf }}"
 {% if kubelet_config_extra_args %}
 {{ kubelet_config_extra_args | to_nice_yaml(indent=2) }}
 {% endif %}
-{% if inventory_hostname in groups['kube_node'] and kubelet_node_config_extra_args %}
-{{ kubelet_node_config_extra_args | to_nice_yaml(indent=2) }}
-{% endif %}
 {% if kubelet_feature_gates or kube_feature_gates %}
 featureGates:
 {% for feature in (kubelet_feature_gates | default(kube_feature_gates, true)) %}

roles/kubernetes/node/templates/kubelet.env.v1beta1.j2

@@ -25,7 +25,7 @@ KUBELET_HOSTNAME="--hostname-override={{ kube_override_hostname }}"
 {%   endif %}
 {% endif %}
 
-KUBELET_ARGS="{{ kubelet_args_base }} {% if node_taints|default([]) %}--register-with-taints={{ node_taints | join(',') }} {% endif %} {% if kubelet_custom_flags is string %} {{kubelet_custom_flags}} {% else %}{% for flag in kubelet_custom_flags %} {{flag}} {% endfor %}{% endif %}{% if inventory_hostname in groups['kube_node'] %}{% if kubelet_node_custom_flags is string %} {{kubelet_node_custom_flags}} {% else %}{% for flag in kubelet_node_custom_flags %} {{flag}} {% endfor %}{% endif %}{% endif %}"
+KUBELET_ARGS="{{ kubelet_args_base }} {% if node_taints|default([]) %}--register-with-taints={{ node_taints | join(',') }} {% endif %} {% if kubelet_custom_flags is string %} {{kubelet_custom_flags}} {% else %}{% for flag in kubelet_custom_flags %} {{flag}} {% endfor %}{% endif %}"
 {% if kubelet_flexvolumes_plugins_dir is defined %}
 KUBELET_VOLUME_PLUGIN="--volume-plugin-dir={{ kubelet_flexvolumes_plugins_dir }}"
 {% endif %}