krb5: new tag kfw-4.1-beta3-mit

[Tom Yu]

A new lightweight tag "kfw-4.1-beta3-mit" has been created in the krb5
repository for the following commit:

commit a755f8ffae1b3b5219a525ed26563423b7faff3c
Author: Tom Yu <tlyu at mit.edu>
Date:   Mon Apr 11 16:31:42 2016 -0400

    Updates for kfw-4.1-beta3-mit