fix-mistake-regex-for-resolv-conf (#9523)

roles/kubernetes/preinstall/tasks/0040-set_facts.yml

@@ -70,7 +70,7 @@
 
     - name: get currently configured nameservers
       set_fact:
-        configured_nameservers: "{{ resolvconf_slurp.content | b64decode | regex_findall('\\s*nameserver\\s*(.*)') | ipaddr }}"
+        configured_nameservers: "{{ resolvconf_slurp.content | b64decode | regex_findall('^nameserver\\s*(.*)', multiline=True) | ipaddr }}"
       when: resolvconf_slurp.content is defined
 
   when: resolvconf_stat.stat.exists is defined and resolvconf_stat.stat.exists