Fix some nits in the crawler and elsewhere.

plugin/builtin/hashtransformer/HashTransformer.go

@@ -19,7 +19,7 @@ type plugin struct {
 var KustomizePlugin plugin
 
 func (p *plugin) Config(
-	h *resmap.PluginHelpers, config []byte) (err error) {
+	h *resmap.PluginHelpers, _ []byte) (err error) {
 	p.hasher = h.ResmapFactory().RF().Hasher()
 	return nil
 }