pull up r23820 from trunk

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 r23820 | ghudson | 2010-03-19 09:17:05 -0700 (Fri, 19 Mar 2010) | 7 lines

 ticket: 6680
 target_version: 1.8.1
 tags: pullup

 Document the ticket_lifetime libdefaults setting (which was added in
 r16656, #2656).  Based on a patch from nalin@redhat.com.

https://github.com/krb5/krb5/commit/d397a8f694d82e02ab3ceb571ec99d34ae37602c
Commit By: tlyu
Revision: 23827
Changed Files:
U   branches/krb5-1-8/doc/admin.texinfo
U   branches/krb5-1-8/src/config-files/krb5.conf.M