Do not read the services from system by default in AutoYast

- bnc#887694
- Takes too long and confuses users anyway
- Showing just info that it hasn't been configured yet
- Cloning or entering the module makes it read the services
  and also ready for export
Adapted test-case
Changes and new version
Merge pull request #82 from kobliha/fix-clone-and-export-functionality

Do not read the services from system by default in AutoYast
Do not `switch!` services that are already in desired state

- switching would put them into undesired state
- and could also kill Yast (bnc#884756)
Changes file entry and a new version
Merge pull request #83 from kobliha/fix-restarting-yast-services

Do not stop/start service that is already stopped/started
Clear errors list if user decides to continue

 * Implemented by delegating ServiceManager.errors to ServiceManagerService
Fix last changelog entry by including the bnc
Some tests polishing