Fix for adding NSD via osm repo-index and with nfpkg-repo-show

There is currently a bug when using the repo-index command to update a repository index with NS packages. Valid NS packages are being rejected due to field validation, specifically the 'name' field which has been corrected.

There is also an issue with the nfpkg-repo-show and nspkg-repo-show commands whereby the pkg_get function will throw a "Wrong Package Type" error if the descriptor contains (valid) fields.