Added validate function to Robust Mlog and MLog test cases

Squashed commit of the following:

commit 11ce1479dbf63928040ba110d50cd4221187c35e
Author: Mark Wellons <mwellons@gopivotal.com>
Date:   Wed Jun 26 15:38:22 2013 -0700

    Added validate function to Robust Mlog and MLog test cases