TUN-1099: Bring back changes in 2018.10.1

cmd/cloudflared/tunnel/hello.go

@@ -0,0 +1,20 @@
+package tunnel
+
+import (
+	"fmt"
+
+	"gopkg.in/urfave/cli.v2"
+
+	"github.com/cloudflare/cloudflared/hello"
+)
+
+func helloWorld(c *cli.Context) error {
+	address := fmt.Sprintf(":%d", c.Int("port"))
+	listener, err := hello.CreateTLSListener(address)
+	if err != nil {
+		return err
+	}
+	defer listener.Close()
+	err = hello.StartHelloWorldServer(logger, listener, nil)
+	return err
+}