Fixed identifier service and database service tests

...tuwien/service/DatabaseServiceIntegrationElasticTest.java

...src/main/java/at/tuwien/endpoints/IdentifierEndpoint.java

...ice/src/test/java/at/tuwien/auth/AuthTokenFilterTest.java

...at/tuwien/endpoint/IdentifierEndpointIntegrationTest.java

...t/java/at/tuwien/endpoint/IdentifierEndpointUnitTest.java

.../java/at/tuwien/endpoint/PersistenceEndpointUnitTest.java

...t/java/at/tuwien/gateway/QueryServiceGatewayUnitTest.java

.../at/tuwien/service/DataCiteIdentifierServiceUnitTest.java

...a/at/tuwien/service/IdentifierServiceIntegrationTest.java

...est/java/at/tuwien/service/IdentifierServiceUnitTest.java

...t-service/src/test/resources/bibliography/style_ieee0.txt

...t-service/src/test/resources/bibliography/style_ieee2.txt

.../main/java/at/tuwien/exception/AccessDeniedException.java

.../main/java/at/tuwien/repository/jpa/AccessRepository.java

...rvices/src/main/java/at/tuwien/service/AccessService.java

...c/main/java/at/tuwien/service/impl/AccessServiceImpl.java

...tadata-db/test/src/main/java/at/tuwien/test/BaseTest.java