[FIX] sale_coupon: Don't update automatic rewards on the fly

Purpose
=======

Currently we are updating the coupon rewards on the fly when creating/modifying/deleting a sales order line.

To avoid multiple searches on res_partners and product to know whether the customer/product is valid on the sale coupon program, we store the applicable customers and products on the program according to the domain defined on it.

This brings 2 issues:
- The customers/products stored on the program are not updated (Was the original spec)
- The checks are numerous and maybe overkill for the given results

Specification
=============

- Don't recompute the reward lines on SO modifications. Add a button to compute the line by hand and make an automatic compute on the SO validation or on the page shop/payment.

- When recomputing the reward lines, make a search on the res_partners and products instead. Now that the action is not triggered so often we can afford to make a search.

- Don't use the fields rule_partners_domain and rule_products_domain. This should be removed in master.

- The field is_public_included is useless now. And we decided to make the coupon available for all the partners if they fit the domain on the program.

tests/test_program_without_code_operations.py

@@ -22,6 +22,7 @@ class TestProgramWithoutCodeOperations(TestSaleCouponCommon):
                 'product_uom_qty': 1.0,
             })
         ]})
+        order.recompute_coupon_lines()
         self.assertEqual(len(order.order_line.ids), 1, "The promo offer shouldn't have been applied as the product B isn't in the order")
 
         # Test case 2 (1 A 1 B): Assert that no reward is given, as the product B is not present in the correct quantity
@@ -33,14 +34,17 @@ class TestProgramWithoutCodeOperations(TestSaleCouponCommon):
                 'product_uom_qty': 1.0,
             })
         ]})
+        order.recompute_coupon_lines()
         self.assertEqual(len(order.order_line.ids), 2, "The promo offer shouldn't have been applied as 2 product A aren't in the order")
 
         # Test case 3 (2 A 1 B): Assert that the reward is given as the product B is now in the order
         order.write({'order_line': [(1, order.order_line[0].id, {'product_uom_qty': 2.0})]})
+        order.recompute_coupon_lines()
         self.assertEqual(len(order.order_line.ids), 3, "The promo offert should have been applied, the discount is not created")
 
         # Test case 4 (1 A 1 B): Assert that the reward is removed as we don't buy 2 products B anymore
         order.write({'order_line': [(1, order.order_line[0].id, {'product_uom_qty': 1.0})]})
+        order.recompute_coupon_lines()
         self.assertEqual(len(order.order_line.ids), 2, "The promo reward should have been removed as the rules are not matched anymore")
         self.assertEqual(order.order_line[0].product_id.id, self.product_A.id, "The wrong line has been removed")
         self.assertEqual(order.order_line[1].product_id.id, self.product_B.id, "The wrong line has been removed")
@@ -50,5 +54,6 @@ class TestProgramWithoutCodeOperations(TestSaleCouponCommon):
             (1, order.order_line[0].id, {'product_uom_qty': 2.0}),
             (2, order.order_line[0].id, False)
         ]})
+        order.recompute_coupon_lines()
         self.assertEqual(len(order.order_line.ids), 1, "The promo reward should have been removed as the rules are not matched anymore")
         self.assertEqual(order.order_line.product_id.id, self.product_B.id, "The wrong line has been removed")