Test that kinit -k -i picks the intended principal

Prior to ticket 7892 it would use the default host/ principal
when no principal was given on the command line.

https://github.com/krb5/krb5/commit/44adf120d8548b9bb43a380e6f1889840c4a4a3d
Author: Ben Kaduk <kaduk@mit.edu>
Commit: 44adf120d8548b9bb43a380e6f1889840c4a4a3d
Branch: master
 src/tests/t_keytab.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)