krb5: new tag krb5-1.15-beta1

[Tom Yu]

A new lightweight tag "krb5-1.15-beta1" has been created in the krb5
repository for the following commit:

commit 0c52f5a40de1e220e67ab1ecf218014b36686a00
Author: Tom Yu <tlyu at mit.edu>
Date:   Wed Oct 19 17:00:49 2016 -0400

    Updates for krb5-1.15-beta1