Fix tests for services package

- Remote first parameter of @Config(...) for AbstractServiceIT
- Remove unused import for AbstractServiceIT, InitializerServiceTest
- ObserverServiceTest
- remove ObserverServiceTest.registerScannerJobInJobScheduler(): real method have been deleted
- fix ObserverServiceTest.createRemoteFolder(): replace folder creation remote operation
- remove call of 'registerScannerJobInJobScheduler()' from ObserverServiceTest.shouldWork()
and lastSyncWasLessThan15minAgo_shouldStop() and lastSync15minAnd30secAgo_shouldStart()
, noAccount_shouldStop() and InitializationNotDone_shouldStop()