lib/krb5: correctly follow KRB5_KDC_ERR_WRONG_REALM client referrals
lib/krb5: correctly follow KRB5_KDC_ERR_WRONG_REALM client referrals

An AS-REQ with an enterprise principal will always directed to a kdc of the local
(default) realm. The KDC directs the client into the direction of the
final realm. See rfc6806.txt.

Signed-off-by: Stefan Metzmacher <f1988b9e977fc98ae4b41148d1c7fe6accb829c3@samba.org>

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