pull up r22292 from trunk

pull up r22292 from trunk

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 r22292 | hartmans | 2009-04-29 20:38:48 -0400 (Wed, 29 Apr 2009) | 10 lines
 Changed paths:
    M /trunk/src/kdc/kdc_preauth.c

 ticket: 6480
 Subject: Do not return PREAUTH_FAILED on unknown preauth
 Target_Version: 1.7
 Tags: pullup

 If the KDC receives unknown pre-authentication data then ignore it.
 Do not get into a case where PREAUTH_FAILED is returned because of
 unknown pre-authentication.  The main AS loop will cause
 PREAUTH_REQUIRED to be returned if the preauth_required flag is set
 and no valid preauth is found.

ticket: 6480
version_fixed: 1.7

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@22334 dc483132-0cff-0310-8789-dd5450dbe970