Integrated keycloak integration test

dbrepo-metadata-service/pom.xml

...c/test/java/at/tuwien/config/KeycloakContainerConfig.java

...st/java/at/tuwien/endpoints/DatabaseEndpointUnitTest.java

...java/at/tuwien/endpoints/PersistenceEndpointUnitTest.java

...t/java/at/tuwien/endpoints/TableDataEndpointUnitTest.java

...c/test/java/at/tuwien/endpoints/ViewEndpointUnitTest.java

...rc/test/java/at/tuwien/service/AccessServiceUnitTest.java

.../java/at/tuwien/service/DatabaseServiceComponentTest.java

...t/java/at/tuwien/service/QueryServiceIntegrationTest.java

...st/java/at/tuwien/service/UserServiceIntegrationTest.java

.../src/test/java/at/tuwien/service/UserServiceUnitTest.java

...ce/rest-service/src/test/resources/application.properties

...service/rest-service/src/test/resources/dbrepo-realm.json

...ices/src/main/java/at/tuwien/gateway/KeycloakGateway.java

...main/java/at/tuwien/gateway/impl/KeycloakGatewayImpl.java

.../main/java/at/tuwien/interceptor/KeycloakInterceptor.java

...services/src/main/java/at/tuwien/service/UserService.java

...src/main/java/at/tuwien/service/impl/UserServiceImpl.java