Issue is that when a model inherits from phone.Validation.mixin, then from
mail.thread.phone (which inherits from phone.validation.mixin) we have
an issue :
TypeError: Cannot create a consistent method resolution
order (MRO) for bases BaseModel, base, mail.thread, phone.validation.mixin,
mail.thread.phone
As fixing it could be complicated we have a way to avoid it: move conflicting
code as it is used only in mail.thread.phone .
In this commit we also import a file forgotten at d2809cbd94 which triggers
the issue itself.
Task 2063049 (bug spotted)
Task 2061765 (triggering the issue)
closesodoo/odoo#36580
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>