Record start time of AS requests earlier in KDC

In process_as_req(), get the current time before any KDB lookups, so
that KDB modules can more correctly audit how long the processing of
an AS request takes.

[ghudson@mit.edu: rewrote commit message]

https://github.com/krb5/krb5/commit/76dfd983d821773ad9029bb9cb9ddefebefb4d33
Author: Andreas Schneider <asn@samba.org>
Committer: Greg Hudson <ghudson@mit.edu>
Commit: 76dfd983d821773ad9029bb9cb9ddefebefb4d33
Branch: master
 src/kdc/do_as_req.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)