Starting from this commit bounce addresses set in emails will not use any
plus addressing. They will always be ``bounce_alias#@alias_domain`` and
not ``bounce_alias+<mail_id>-<mail_model>-<mail_res_id>@alias_domain``.
Reasons are
* this plus addressing adds information we do not use anymore since a long
time as bounced messages are found using their message ID and not any
information coming from this bounce address;
* this generates unnecessary noise;
* not all email providers really support plus addressing as a mean to
generate "fake" additional email addresses;
This is the followup of odoo/odoo#71244 where a solution to avoid plus
addressing was done in table. We can now safely remove this feature in
master as a cleaning step.
Task ID-2577328
closesodoo/odoo#73363
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>