OZG-3276 OZG-3319 cleanup; add Tests; refactor ITCase

...erver/src/main/java/de/itvsh/kop/user/UserRepository.java

...a/de/itvsh/kop/user/UserProfileResourceAssemblerTest.java

...est/java/de/itvsh/kop/user/UserProfileResourceITCase.java

...src/test/java/de/itvsh/kop/user/UserRepositoryITCase.java

...rver/src/test/java/de/itvsh/kop/user/UserServiceTest.java

...rver/src/test/java/de/itvsh/kop/user/UserTestFactory.java

...de/itvsh/kop/user/settings/UserSettingsServiceITCase.java

.../de/itvsh/kop/user/userprofile/UserProfileMapperTest.java