krb5: new tag krb5-1.13.7-final

[Tom Yu]

A new lightweight tag "krb5-1.13.7-final" has been created in the krb5
repository for the following commit:

commit 7e012d0306532f04fca27351e21d545bc351b305
Author: Tom Yu <tlyu at mit.edu>
Date:   Thu Sep 15 17:51:24 2016 -0400

    Updates for krb5-1.13.7