cmd/loopd: point to testnet loop server for testnet mode

Fixes #20.

cmd/loopd/config.go

@@ -21,9 +21,14 @@ type config struct {
 	View viewParameters `command:"view" alias:"v" description:"View all swaps in the database. This command can only be executed when loopd is not running."`
 }
 
+const (
+	mainnetServer = "swap.lightning.today:11009"
+	testnetServer = "test.swap.lightning.today:11009"
+)
+
 var defaultConfig = config{
 	Network:    "mainnet",
-	SwapServer: "swap.lightning.today:11009",
+	SwapServer: mainnetServer,
 	RPCListen:  "localhost:11010",
 	RESTListen: "localhost:8081",
 	Insecure:   false,

cmd/loopd/daemon.go

@@ -26,6 +26,12 @@ func daemon(config *config) error {
 	}
 	defer lnd.Close()
 
+	// If the user is targeting the testnet network, then we'll point
+	// towards the testnet swap server rather than the mainnet endpoint.
+	if config.Network == "testnet" {
+		config.SwapServer = testnetServer
+	}
+
 	swapClient, cleanup, err := getClient(
 		config.Network, config.SwapServer, config.Insecure, &lnd.LndServices,
 	)