[MIG] sale_three_discounts_ux: Migration to 15.0
[MIG] sale_three_discounts_ux: Migration to 15.0

closes ingadhoc/sale#508

Signed-off-by: Nicolas Mac Rouillon <8d34fe7b7c65100e706828a8c0d03426900ffb59@adhoc.com.ar>

ingadhoc/sale,ingadhoc/sale,ingadhoc/sale,ingadhoc/sale