itest+lntest: migrate lntemp to lntest

This commit performs the takeover that `lntemp` is now promoted to be
`lntest`, and the scaffolding is now removed as all the refactoring is
finished!

lntest/rpc/watchtower.go

@@ -0,0 +1,52 @@
+package rpc
+
+import (
+	"context"
+
+	"github.com/lightningnetwork/lnd/lnrpc/watchtowerrpc"
+	"github.com/lightningnetwork/lnd/lnrpc/wtclientrpc"
+)
+
+// =====================
+// WatchtowerClient and WatchtowerClientClient related RPCs.
+// =====================
+
+// GetInfoWatchtower makes a RPC call to the watchtower of the given node and
+// asserts.
+func (h *HarnessRPC) GetInfoWatchtower() *watchtowerrpc.GetInfoResponse {
+	ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
+	defer cancel()
+
+	req := &watchtowerrpc.GetInfoRequest{}
+	info, err := h.Watchtower.GetInfo(ctxt, req)
+	h.NoError(err, "GetInfo from Watchtower")
+
+	return info
+}
+
+// AddTower makes a RPC call to the WatchtowerClient of the given node and
+// asserts.
+func (h *HarnessRPC) AddTower(
+	req *wtclientrpc.AddTowerRequest) *wtclientrpc.AddTowerResponse {
+
+	ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
+	defer cancel()
+
+	resp, err := h.WatchtowerClient.AddTower(ctxt, req)
+	h.NoError(err, "AddTower")
+
+	return resp
+}
+
+// WatchtowerStats makes a RPC call to the WatchtowerClient of the given node
+// and asserts.
+func (h *HarnessRPC) WatchtowerStats() *wtclientrpc.StatsResponse {
+	ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
+	defer cancel()
+
+	req := &wtclientrpc.StatsRequest{}
+	resp, err := h.WatchtowerClient.Stats(ctxt, req)
+	h.NoError(err, "Stats from Watchtower")
+
+	return resp
+}