krb5: new tag krb5-1.16.1-final

[Greg Hudson]

A new lightweight tag "krb5-1.16.1-final" has been created in the krb5
repository for the following commit:

commit 8e153e3e8feb88780413d642273d60f0c15b2fe6
Author: Greg Hudson <ghudson at mit.edu>
Date:   Thu May 3 10:33:33 2018 -0400

    Update for krb5-1.16.1