Small commit to reset autocommit in 1.4

lib/mysql_connection.cpp

@@ -1585,6 +1585,7 @@ int MySQL_Connection::async_send_simple_command(short event, char *stmt, unsigne
 void MySQL_Connection::reset() {
 	status_flags=0;
 	reusable=true;
+	options.last_set_autocommit=-1; // never sent
 	delete local_stmts;
 	local_stmts=new MySQL_STMTs_local(false);
 }