[FIX] maintenance: do not create random aliases

PURPOSE

Make aliases usage more unique, prevent re-using bounce or catchall aliases
and remove auto-uniqueness of aliases.

SPECIFICATION

Remove automatic aliases creation. Aliases should be created on demand with
real emails owned by users, not hidden in creation.

Task ID 2160070

addons/maintenance/models/maintenance.py

@@ -64,8 +64,6 @@ class MaintenanceEquipmentCategory(models.Model):
     @api.model
     def create(self, vals):
         self = self.with_context(alias_model_name='maintenance.request', alias_parent_model_name=self._name)
-        if not vals.get('alias_name'):
-            vals['alias_name'] = vals.get('name')
         category_id = super(MaintenanceEquipmentCategory, self).create(vals)
         category_id.alias_id.write({'alias_parent_thread_id': category_id.id, 'alias_defaults': {'category_id': category_id.id}})
         return category_id