[FIX] event: fix access right issues

* Limitate rights of event user to reading an event

Event user should not be able to create events. Its rights should be limited
to reading events, creating and updating registrations. Only event managers
are allowed to create and modify events.

* Sudo access on ir.values in event config settings

Configuring events imply modifying auto confirmation parameter which is stored
into an ir.values. As this model is limited to values with user_id = uid we
have to sudo the access here as it is not a user-defined value.

* Add some tests for the various fixed issues

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