Use kube_config_dir for kubeconfig (#7996) (#8037)

The path of kubeconfig should be configurable, and its default value
is /etc/kubernetes/admin.conf. Most paths of the file are configurable
but some were not. This make those configurable.

roles/kubernetes/control-plane/tasks/kubeadm-setup.yml

@@ -150,8 +150,8 @@
 
 - name: Create hardcoded kubeadm token for joining nodes with 24h expiration (if defined)
   shell: >-
-    {{ bin_dir }}/kubeadm --kubeconfig /etc/kubernetes/admin.conf token delete {{ kubeadm_token }} || :;
-    {{ bin_dir }}/kubeadm --kubeconfig /etc/kubernetes/admin.conf token create {{ kubeadm_token }}
+    {{ bin_dir }}/kubeadm --kubeconfig {{ kube_config_dir }}/admin.conf token delete {{ kubeadm_token }} || :;
+    {{ bin_dir }}/kubeadm --kubeconfig {{ kube_config_dir }}/admin.conf token create {{ kubeadm_token }}
   changed_when: false
   when:
     - inventory_hostname == groups['kube_control_plane']|first
@@ -161,7 +161,7 @@
     - kubeadm_token
 
 - name: Create kubeadm token for joining nodes with 24h expiration (default)
-  command: "{{ bin_dir }}/kubeadm --kubeconfig /etc/kubernetes/admin.conf token create"
+  command: "{{ bin_dir }}/kubeadm --kubeconfig {{ kube_config_dir }}/admin.conf token create"
   changed_when: false
   register: temp_token
   retries: 5

roles/kubernetes/control-plane/tasks/kubeadm-upgrade.yml

@@ -62,7 +62,7 @@
 - name: kubeadm | scale down coredns replicas to 0 if not using coredns dns_mode
   command: >-
     {{ bin_dir }}/kubectl
-    --kubeconfig /etc/kubernetes/admin.conf
+    --kubeconfig {{ kube_config_dir }}/admin.conf
     -n kube-system
     scale deployment/coredns --replicas 0
   register: scale_down_coredns