[core] run config_setup_connection() fewer times

config_setup_connection() is run when con struct is init'd and in
connection_reset(), after each request is processed.  It also must be
called upon HANDLER_COMEBACK when the request needs to be re-parsed,
but it need not be run twice in common scenario without HANDLER_COMEBACK

src/connections.c

@@ -1222,6 +1222,9 @@ static int connection_handle_request(server *srv, connection *con) {
 				connection_fdwaitqueue_append(srv, con);
 				break;
 			case HANDLER_COMEBACK:
+				if (con->mode == DIRECT && buffer_is_empty(con->physical.path)) {
+					config_setup_connection(srv, con);
+				}
 				return 1;
 			case HANDLER_ERROR:
 				/* something went wrong */

src/response.c

@@ -306,7 +306,6 @@ handler_t http_response_prepare(server *srv, connection *con) {
 	    if (!con->async_callback) {
 
 		config_cond_cache_reset(srv, con);
-		config_setup_connection(srv, con); /* Perhaps this could be removed at other places. */
 
 		if (con->conf.log_condition_handling) {
 			log_error_write(srv, __FILE__, __LINE__,  "s",  "run condition");