[krbdev.mit.edu #1379] kprop can't handle remote-realm slave

[Ken Raeburn via RT]

Two kprop bugs:

(1) It uses krb5_get_in_tkt_with_keytab; it should use the
    get_init_creds functions.  (Okay, this is nitpicking.)

(2) Since it gets no TGT, and instead gets a ticket for the host
    service on the slave host, it can't cope with a slave host that's
    not in the local realm.

Ken