Wrong path is here:
<?php
include_once "htmllib/lib/include.php";
chdir("/usr/local/lxlabs/lxadmin/httpdocs/");
$pass = slave_get_db_pass();
$res = mysql_connect("localhost", "root", $pass);
$dbadminpass = trim(file_get_contents("/usr/local/lxlabs/lxadmin/etc/conf/lxadmin.pass"));
print($dbadminpass);
print("n");
mysql_query("grant all on kloxo.* to 'kloxo'@'localhost' identified by '$dbadminpass';");
mysql_query("flush privileges");