improve temp dirs handling an some logs

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/vfs/s3fs.go

@@ -82,11 +82,7 @@ func init() {
 // object storage
 func NewS3Fs(connectionID, localTempDir, mountPath string, s3Config S3FsConfig) (Fs, error) {
 	if localTempDir == "" {
-		if tempPath != "" {
-			localTempDir = tempPath
-		} else {
-			localTempDir = filepath.Clean(os.TempDir())
-		}
+		localTempDir = getLocalTempDir()
 	}
 	fs := &S3Fs{
 		connectionID: connectionID,