[FIX] purchase_stock: average cost

- Create 2 rates:
2019-05-01: 1.0
2019-06-01: 0.5
- Set-up a product A in AVCO
- Create a PO for A on 2019-05-15
- Receive the product after 2019-06-01

The AML are created with a rate of 0.5, but the product cost is updated
with the rate of 1.0.

This is because the stock move date is used when it is still assigned,
and not done yet. As described in:

https://github.com/odoo/odoo/blob/2f789b6863407e63f90b3a2d4cc3be09815f7002/addons/stock/models/stock_move.py#L36

The date is the scheduled date until the move is done, then it is the
date of the actual move processing.

We change the date to today's date, since it is the value used to update
the move date:

https://github.com/odoo/odoo/blob/2f789b6863407e63f90b3a2d4cc3be09815f7002/addons/stock/models/stock_move.py#L1143

opw-2006368

Note: the test has been slightly refactored to avoid an inconsistency
between `fields.Date.context_today` and `fields.Datetime.now`. Now, they
both return the same day. Moreover, the date is updated before each
action.

closes odoo/odoo#34444

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

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