mod_http_oauth2: Deduplicate client authentication Since it is always performed by each grant_type_handler, it can now be done earlier before dispatching to them. A note on 4f0ed0e3ad5a: Requiring a client in the password grant broke use without registering a client, e.g. the Snikket Web Portal.

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summary: Extra verbose logging of sent and received
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Summary
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Sometimes it is useful to get the raw XML logs from clients for
debugging purposes, but some clients don't expose this.

This module logs dumps everything sent and received into debug logs, for
debugging purposes.