mod_http_oauth2: Reorder metadata by source Following the order in which field are described in each specification. Also fills in `nil` fields that are defined but not used in this module. Tweaks some values to reflect current behavior.

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summary: Log a message once per minute
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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.