Use hmac-md5 checksum for PA-FOR-USER padata
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
target_version: 1.9.2
tags: pullup
git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@24929
dc483132-0cff-0310-8789-
dd5450dbe970