finished flight controller and service tests

...src/main/java/cz/muni/fi/pa165/rest/FlightController.java

...c/test/java/cz/muni/fi/pa165/facade/FlightFacadeTest.java

.../cz/muni/fi/pa165/facade/FlightRealizationFacadeTest.java

...t/java/cz/muni/fi/pa165/facade/IssueReportFacadeTest.java

...test/java/cz/muni/fi/pa165/rest/FlightControllerTest.java

...z/muni/fi/pa165/rest/FlightRealizationControllerTest.java

...z/muni/fi/pa165/service/FlightRealizationServiceTest.java

...test/java/cz/muni/fi/pa165/service/FlightServiceTest.java

.../src/test/java/cz/muni/fi/pa165/utils/TestDaoFactory.java