* Added mod_reservations prosody plugin

* Removed comments re mutex

* Add support for HTTP retries and expose config to tweak retry behaviour

* Removed TODO comment. Feature implemented

* Added multi-tenant support

* renamed config var and default to always including tenant name in name field

* Simplified handling of multi-tenant

* Fixed bug with DELETE not called on reservation expiry

* fix: Fixes destroying room.

Co-authored-by: damencho <damencho@jitsi.org>