krb5: new tag kfw-4.2-beta1-mit

[Greg Hudson]

A new lightweight tag "kfw-4.2-beta1-mit" has been created in the krb5
repository for the following commit:

commit e96401ca212302e54b15ba9be9f05e1656c64a4d
Author: Greg Hudson <ghudson at mit.edu>
Date:   Tue Apr 2 11:22:06 2019 -0400

    Updates for kfw-4.2-beta1-mit