pull up r24929 from trunk

pull up r24929 from trunk

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 r24929 | ghudson | 2011-05-14 10:49:00 -0400 (Sat, 14 May 2011) | 11 lines

 ticket: 6912
 subject: Use hmac-md5 checksum for PA-FOR-USER padata
 target_version: 1.9.2
 tags: pullup

 The MS-S4U documentation specifies that hmac-md5 be used for
 PA-FOR-USER checksums; we were using the mandatory checksum type for
 the key.  Although some other checksum types appear to be allowed by
 Active Directory KDCs, Richard Silverman reports that md5-des is not
 one of them, causing S4U2Self requests to fail for DES keys.

ticket: 6912
version_fixed: 1.9.2
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-9@24954 dc483132-0cff-0310-8789-dd5450dbe970