TRUNK-4389: Added DRUG_ORDER_TYPE_UUID & TEST_ORDER_TYPE_UUID constants to OrderType class,
Added unit test method saveOrder_shouldSetOrderTypeOfDrugOrderToDrugOrderIfNotSetAndConceptNotMapped to OrderServiceTest,
Added unit tests and code to set order type of drug/test order to drug/test order respectively if not set and concept not mapped in saveOrder() method
Merge pull request #950 from mhawila/TRUNK-4389

TRUNK-4389: Added DRUG_ORDER_TYPE_UUID & TEST_ORDER_TYPE_UUID constants ...