* refactor

1. Auth module was initialized inside dns.go - now it's moved to initWeb()

2. stopHTTPServer() wasn't called on server stop - now we do that

3. Don't use postInstall() HTTP filter where it's not necessary.
Now we register handlers after installation is complete.

home/control_update.go

@@ -476,7 +476,6 @@ func doUpdate(u *updateInfo) error {
 func finishUpdate(u *updateInfo) {
 	log.Info("Stopping all tasks")
 	cleanup()
-	stopHTTPServer()
 	cleanupAlways()
 
 	if runtime.GOOS == "windows" {