[nginx] Add default subdomain for nginx

ansible/roles/nginx/templates/nginx.conf.j2

@@ -14,7 +14,7 @@ http {
 
     server {
         listen 80;
-        server_name *.{{ansible_hostname}}.local;
+        server_name www.{{ansible_hostname}}.local;
         root   /usr/local/www/;
 
         include /usr/local/etc/nginx/locations/*.conf;