lntest: fix macaroon paths

This change makes sure that all macaroons are stored in the same
folder. This makes it possible to use the lntest package in external
projects that use loop's lndclient library which currently assumes
that the admin macaroon and subserver macaroons are in the same sub
folder of lnd's data directory.

lntest/node.go

@@ -298,9 +298,13 @@ func newNode(cfg NodeConfig) (*HarnessNode, error) {
 	cfg.LogDir = filepath.Join(cfg.BaseDir, "log")
 	cfg.TLSCertPath = filepath.Join(cfg.DataDir, "tls.cert")
 	cfg.TLSKeyPath = filepath.Join(cfg.DataDir, "tls.key")
-	cfg.AdminMacPath = filepath.Join(cfg.DataDir, "admin.macaroon")
-	cfg.ReadMacPath = filepath.Join(cfg.DataDir, "readonly.macaroon")
-	cfg.InvoiceMacPath = filepath.Join(cfg.DataDir, "invoice.macaroon")
+
+	networkDir := filepath.Join(
+		cfg.DataDir, "chain", "bitcoin", cfg.NetParams.Name,
+	)
+	cfg.AdminMacPath = filepath.Join(networkDir, "admin.macaroon")
+	cfg.ReadMacPath = filepath.Join(networkDir, "readonly.macaroon")
+	cfg.InvoiceMacPath = filepath.Join(networkDir, "invoice.macaroon")
 
 	cfg.P2PPort, cfg.RPCPort, cfg.RESTPort, cfg.ProfilePort = generateListeningPorts()