If built with system MIT krb5 and dns_lookup_kdc is set to false in
system krb5.conf tests fail because KDC is not found.
Pair-Programmed-With: Andreas Schneider <asn@samba.org> Signed-off-by: Samuel Cabrero <scabrero@suse.de> Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>