pull up r22360 from trunk

pull up r22360 from trunk
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 r22360 | ghudson | 2009-05-22 16:08:25 +0200 (Fri, 22 May 2009) | 10 lines

 ticket: 6492
 subject: Remove spurious assertion in handle_authdata
 tags: pullup
 target_version: 1.7

 In handle_authdata in the KDC, remove a spurious assertion (added in
 r21566 on the mskrb-integ branch) that authdata starts out empty.
 authdata can be legitimately added by check_padata, which precedes
 handle_authdata, and this happens with pkinit.

ticket: 6492
version_fixed: 1.7

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@22375 dc483132-0cff-0310-8789-dd5450dbe970