Comment more packages to pass go lint

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

labels/validate.go

@@ -9,15 +9,13 @@ const (
 	maxSize = 4096
 )
 
+// Validate a label's key and value are under 4096 bytes
 func Validate(k, v string) error {
-	// A label key and value should be under 4096 bytes
 	if (len(k) + len(v)) > maxSize {
 		if len(k) > 10 {
 			k = k[:10]
 		}
-
 		return errors.Wrapf(errdefs.ErrInvalidArgument, "label key and value greater than maximum size (%d bytes), key: %s", maxSize, k)
 	}
-
 	return nil
 }