pull up r25076 from trunk

pull up r25076 from trunk

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 r25076 | ghudson | 2011-08-08 14:27:15 -0400 (Mon, 08 Aug 2011) | 14 lines

 ticket: 6941
 subject: Fix accidental KDC use of replay cache
 target_version: 1.9.2
 tags: pullup

 r24464 (ticket #6804) intended to remove the KDC replay cache by
 eliminating all of the USE_RCACHE code, but it had the unintended side
 effect of causing krb5_rd_req_decoded to use the default server
 rcache.  Using this cache is much less efficient because it is opened
 and re-read for each request.

 Set appropriate flags on the auth context to disable replay cache use
 for TGS requests altogether.

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ticket: 6941
version_fixed: 1.9.2
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-9@25374 dc483132-0cff-0310-8789-dd5450dbe970