SPIKE: Investigate wrong calculation of the due date when there is a an exceptional closed period

In BNCF production and test enviroment (Iris Q1 2021) the due date of an item doesn't consider the  exceptional closed period.

Step to reproduce:

1. Logged in https://bncf-test.folio.ebsco.com/  (it's the BNCF Folio test)
2. Went into Settings - Calendar
3. Selected SP: SP-Sala lettura
4. Selected Open calendar to add exceptions and added a new exception period from the 22nd of july to the end of month
5. Went in to the Checkout app, entered user with barcode CF0235310 and item barcode 006015858 (the loan policy is set for 7 days)
6. The due date of the item is 5th of August

Expected: The due date should consider the exceptional closed period and it should be the 9th of August

Actual: The due date of the item is 5th of August