(and wrong) usage of KRB5_KU_AP_REQ_AUTH for backwards compatibility
(krb5_verify_ap_req2): new function for specifying the usage different
from the default (KRB5_KU_AP_REQ_AUTH)
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@9199 ec53bebd-3082-4978-b11e-865c3cabbd6b