Improve Access log configuration for Nginx

roles/webserver/templates/nginx/nginx.conf.j2

@@ -79,8 +79,8 @@ http {
     # Format to use in log files
     log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                     '$status $body_bytes_sent "$http_referer" '
-                    '"$http_user_agent" "$http_x_forwarded_for"';
-
+                    '"$http_user_agent" "$http_x_forwarded_for" '
+                    '$host ${request_time} ${scheme}"';
 
     ### Default log files ###