Removed reading reading content file in inst-sys
Added test to parse real data (os-release files)
Changed Product.name behavior

- uses OSRelease.ReleaseInformation by default
- as a fallback OSRelease.ReleaseName + OSRelease.ReleaseVersion can be used
Adapted test case to the new behavior
New changes, new version
Added data files needed for tests

- different os-release files
Merge pull request #221 from kobliha/fixed_product_loading

Fixed product loading