pull up r23657 from trunk

pull up r23657 from trunk

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 r23657 | ghudson | 2010-01-14 11:09:24 -0500 (Thu, 14 Jan 2010) | 9 lines

 ticket: 6640
 subject: Make history key exempt from permitted_enctypes
 tags: pullup
 target_version: 1.8

 In kdb_init_hist, just use the first key entry in the kadmin/history
 entry.  This makes the history key work even if the enctype is
 disallowed by allow_weak_crypto=false or other configuration.

ticket: 6640
version_fixed: 1.8
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-8@23659 dc483132-0cff-0310-8789-dd5450dbe970