Set default nameservers to empty list (#1329)

The default 'nameservers' variable is now an empty list instead of specifying Cloudflare and Google DNS. This allows for more flexible configuration and avoids hardcoding external DNS servers.

Author: vitabaks

automation/roles/common/defaults/main.yml

@@ -836,9 +836,9 @@ netdata_conf:
 ############################################################
 
 # DNS servers (/etc/resolv.conf)
-nameservers:
-  - "1.1.1.1" # Cloudflare DNS (primary)
-  - "8.8.8.8" # Google DNS (secondary)
+nameservers: []
+#  - "1.1.1.1" # Cloudflare DNS (primary)
+#  - "8.8.8.8" # Google DNS (secondary)
 
 # /etc/hosts (optional)
 etc_hosts: []