krb5: new tag kfw-4.1-beta2

[Tom Yu]

A new lightweight tag "kfw-4.1-beta2" has been created in the krb5
repository for the following commit:

commit 28fbf18398ef081256d02a49a0dbb8c4452a1744
Author: Ben Kaduk <kaduk at mit.edu>
Date:   Wed Jun 24 17:24:33 2015 -0400

    Bump buildlevel for non-MIT KfW 4.1-beta2