Working with packages and allowed IPs.

giredorectl now able to interact with giredored about:

* Setting package data. There is no such thing as "create" or "update",
just set.

* Deleting package data.

* Setting allowed IP addresses. This is the only authorization method
ATM, more may come in future.

cmd/giredored/main.go

@@ -33,6 +33,7 @@ func main() {
 	go func() {
 		<-signalHandler
 		httpserver.Shutdown()
+		configuration.Shutdown()
 		shutdownDone <- true
 	}()