mod_http_oauth2: Reuse JWT issuance time as substitute for auth time
Makes the token shorter. Since iat and auth_time are generated at about
the same time they would only differ by a few microseconds anyway.
---
summary: Log a message once per minute
...
This module sends `-- MARK --` to the log once per minute. This may be
useful to give a sense of how busy the server is or see that logging and
timers are still working.