created confirm delivery api
added test
Merge branch 'master' into delivery_update_api
Merge branch 'master' into delivery_update_api

Conflicts:
	custom/openlmis/api.py
	custom/openlmis/commtrack.py
	custom/openlmis/tests/mock_api.py
	custom/openlmis/tests/test_apis.py
Merge pull request #1761 from lwyszomi/delivery_update_api

OPENLMIS - Delivery update API