task/us151-ta132 -- OnDelivery - Uncollected Job Item query should be
Delivery Partner aware

nparcel/table/jobitem.py
* updated the uncollected_jobitems_sql() method's signature to accept
  a tuple of Delivery Partners to filter uncollected job items against
* refactored the uncollected_jobitems_sql() method to incorporate
  Delivery Partners filter

nparcel/ondelivery.py
* updated the process() and get_uncollected_job_items() method
  signature to accept a tuple of delivery_partners