Incorrect copyrights and authors in nuget.exe

See https://github.com/swagger-api/swagger-codegen/blob/master/samples/client/petstore/csharp-dotnet2/SwaggerClientTest/Lib/SwaggerClient/nuget.exe?raw=true
See below.
Only `Copyright (c) .NET Foundation` seems correct
```
copyrights:
- copyright: Copyright (c) .NET Foundation
start_line: 9317
end_line: 9317
- copyright: Copyright TargetPath IncludeSymbols
start_line: 47314
end_line: 47316
- copyright: Copyright GetProperty EvaluatedValue
start_line: 57164
end_line: 57166
holders:
- holder: NET Foundation
start_line: 9317
end_line: 9317
- holder: TargetPath IncludeSymbols
start_line: 47315
end_line: 47316
- holder: GetProperty EvaluatedValue
start_line: 57165
end_line: 57166
authors:
- author: signed. Failed
start_line: 10731
end_line: 10732
- author: Repository. Unable
start_line: 10771
end_line: 10772
- author: Certificate Owners
start_line: 25045
end_line: 25047

```