TRUNK-3204 : Add JUnit test for getting by null/true/false isPreferred in HibernatePatientDAO.getPatientIdentifiers

TRUNK-3204: Add JUnit test for getting by null/true/false isPreferred in HibernatePatientDAO.getPatientIdentifiers

TRUNK-3204: Add JUnit test for getting by null/true/false isPreferred in HibernatePatientDAO.getPatientIdentifiers