[rp] Split logs in multiple files

roles/nginx/templates/nginx/sites-available/reverseproxy.j2

@@ -36,8 +36,8 @@ server {
     include "/etc/nginx/snippets/options-ssl.{{ site.ssl|default(nginx.default_ssl_domain) }}.conf";
 
     # Log into separate log files
-    access_log      /var/log/nginx/{{ site.from }}.log;
-    error_log       /var/log/nginx/{{ site.from }}_error.log;
+    access_log      /var/log/nginx/{{ site.from }}/access.log;
+    error_log       /var/log/nginx/{{ site.from }}/error.log;
 
     # Keep the TCP connection open a bit for faster browsing
     keepalive_timeout 70;