Another principal

We now create another principal for the upcoming "single sign on" tests:

In kadmin (local or with ruth) add the principal:

kadmin:  add_principal joe
WARNING: no policy specified for joe@REDFLO.DE; defaulting to no policy
Enter password for principal "joe@REDFLO.DE": 
Re-enter password for principal "joe@REDFLO.DE": 
Principal "joe@REDFLO.DE" created.