Fix *-files inspectors to adhere to format version v2

The inspectors generated normal Arrays as the file lists instead of
using the according model classes. That caused problems when serializing
the descriptions to JSON.
Merge pull request #229 from SUSE/review_140917_fix_inspectors_for_schema_v2

Fix *-files inspectors to adhere to format version v2
Merge branch 'master' into remote_fs_3

Conflicts:
	spec/unit/unmanaged_files_inspector_spec.rb