Extended the current tests to cover all currently supported scenarios
Implemented lazy loading in ServicesManagerServiceClass

- calling the systemctl was in constructor
Implemented lazy loading in ServicesManagerTargetClass

- calling the systemctl was in constructor
Adapted the `Import` testsuite
New changes file entry and new version
Fixed ServicesManagerTargetClass to behave according to testcase

Fixed tests

New date for changelog
Removed pieces that were not needed anymore

- according to comments from review
Merge pull request #77 from kobliha/AutoYast_Export

Fixed AutoYast Export/Import