'save_in_address_book' is required

[TomashKhamlai]

Guest Account:
There is no such field

Customer without address (new):
There is no such field

Customer with address:
There is such field, but not required

Preconditions (*)

1. No preconditions

Steps to reproduce (*)

1. Use setShippingAddressesOnCart for Guest Cart without specifying save_in_address_book.

Expected result (*)

It not required to specify save_in_address_book

Actual result (*)

1. Schema validation problem
   

[TomashKhamlai]

@naydav, please check.

[naydav]

Fix will be part of #509