Adjusting enabled/disabled services in ServicesProposal

- bnc#887688
- sshd service is adjusted by Yast Network but the service status is not exported to AutoYast later and also not handled in AutoYast import - this is a task for ServicesManager
- Added new test - passes
- build also passes
Hmm, good idea, next time :) This is a hotfix and I expect it to be changed later anyway.