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.

https://github.com/krb5/krb5/commit/d7618afafe8c712d09da2bc2f9841ffd7fc1d0c7
Commit By: ghudson
Revision: 25076
Changed Files:
U   trunk/src/kdc/kdc_util.c