[REV] module: bring back openerp import hook

Use `warnings.warn` to log a warning entry on usage of deprecated
import hook instead of `logging.warning`. The `warnings` can be more
easily configured to show/hide class of warnings or to limit warning
emission, plus it is possible to log a single stack entry whereas
logging can just log the entire call stack.

Bring back the various openerp import hooks by reverting 9e1f13bac12

closes odoo/odoo#50604

Task: 2234749
X-original-commit: 5840202802c2ff6ca1ca8fd6f3892900481db5da
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>
Signed-off-by: Christophe Simonis <chs@odoo.com>