Take quantity into account when calculating banded fulfillment option pricing
(cherry picked from commit 5cf105c3bf0d91d85e214f042c96a0242298b0cd)
BLC-832 - Enhance tests for banded weight/price fulfillment to allow for quantities into account. Part of pull request #32 (cherry picked from commit 7bdd21e46baaf9c66d1023de2d2bdc1b135a12e4)