ISSUE-206 Refactor UserUpdater, more refactoring is necessary

...du/kit/scc/webreg/service/impl/UserCreateServiceImpl.java

...edu/kit/scc/webreg/service/impl/UserLoginServiceImpl.java

...java/edu/kit/scc/webreg/service/impl/UserServiceImpl.java

...webreg/service/impl/UserUpdateFromHomeOrgServiceImpl.java

...du/kit/scc/webreg/service/impl/UserUpdateServiceImpl.java

...du/kit/scc/webreg/service/saml/SamlSpPostServiceImpl.java

.../edu/kit/scc/webreg/service/impl/AbstractUserUpdater.java

...ava/edu/kit/scc/webreg/service/impl/OAuthUserUpdater.java

...java/edu/kit/scc/webreg/service/impl/OidcUserUpdater.java

...java/edu/kit/scc/webreg/service/impl/SamlUserUpdater.java

...ain/java/edu/kit/scc/webreg/service/impl/UserUpdater.java

...edu/kit/scc/webreg/service/user/UserLifecycleManager.java