plugin/autopath: Add metrics and remove log line (#1143)

* plugin/autopath: Add namespace selector and metrics

Add a namespace, so autopathing only is performed in this namespace.
This will make caching work for the cluster again.

Also export metrics that we've done a successful autopath

* dont shadow

* Fix

* Back the namespacing changes

plugin/autopath/setup.go

@@ -26,6 +26,8 @@ func setup(c *caddy.Controller) error {
 		return plugin.Error("autopath", err)
 	}
 
+	c.OnStartup(OnStartupMetrics)
+
 	// Do this in OnStartup, so all plugin has been initialized.
 	c.OnStartup(func() error {
 		m := dnsserver.GetConfig(c).Handler(mw)