Instead of walking paths ourselves, just let Go's packages library do
it. This is a slight CLI change - it wants "./foo" rather than "foo".
This also flagged a few things which seem to be legit failures.
GetFileType is meant to return the type of the given file by using os.Stat.
However, os.Stat doesn't work on Windows for Unix Sockets, causing an error to occur:
[2-Socket Test] unexpected error :
CreateFile C:\Users\Administrator\AppData\Local\Temp\test-get-filetype-2776877299\mt.sock:
The file cannot be accessed by the system.
This is a known issue and we're already using a workaround for this in
pkg/kubelet/util/util_windows.go.
This commit fixes this issue for GetFileType on Windows.
