mod_http_oauth2: Calculate client secret expiry in registration response Not actually the client_secret that expires, but the client_id JWT. Returning '0' indicating no expiry was incorrect unless JWT expiry is turned off, which we check for now.

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summary: Remote Roster Management
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Introduction
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This module adds support for [XEP-0321: Remote Roster Management] which
is commonly used to allow components such as transports to modify the
rosters of local users.