update to latest 2.26.0 kubespray version and add dns zones settings to coredns

kubespray/project/roles/kubernetes/preinstall/tasks/0100-dhclient-hooks.yml

@@ -2,16 +2,16 @@
 - name: Configure dhclient to supersede search/domain/nameservers
   blockinfile:
     block: |-
-      {% for item in [supersede_domain, supersede_search, supersede_nameserver] -%}
+      {% for item in [supersede_domain, supersede_search, supersede_nameserver] | reject('equalto', '') -%}
       {{ item }}
       {% endfor %}
     path: "{{ dhclientconffile }}"
-    create: yes
+    create: true
     state: present
     insertbefore: BOF
-    backup: yes
+    backup: true
     marker: "# Ansible entries {mark}"
-    mode: 0644
+    mode: "0644"
   notify: Preinstall | propagate resolvconf to k8s components
 
 - name: Configure dhclient hooks for resolv.conf (non-RH)
@@ -19,7 +19,7 @@
     src: dhclient_dnsupdate.sh.j2
     dest: "{{ dhclienthookfile }}"
     owner: root
-    mode: 0755
+    mode: "0755"
   notify: Preinstall | propagate resolvconf to k8s components
   when: ansible_os_family not in [ "RedHat", "Suse" ]
 
@@ -28,6 +28,6 @@
     src: dhclient_dnsupdate_rh.sh.j2
     dest: "{{ dhclienthookfile }}"
     owner: root
-    mode: 0755
+    mode: "0755"
   notify: Preinstall | propagate resolvconf to k8s components
   when: ansible_os_family == "RedHat"