Don't use a global logger (#423)

cmd/nebula-service/main.go

@@ -46,15 +46,16 @@ func main() {
 		os.Exit(1)
 	}
 
-	config := nebula.NewConfig()
+	l := logrus.New()
+	l.Out = os.Stdout
+
+	config := nebula.NewConfig(l)
 	err := config.Load(*configPath)
 	if err != nil {
 		fmt.Printf("failed to load config: %s", err)
 		os.Exit(1)
 	}
 
-	l := logrus.New()
-	l.Out = os.Stdout
 	c, err := nebula.Main(config, *configTest, Build, l, nil)
 
 	switch v := err.(type) {

cmd/nebula-service/service.go

@@ -24,14 +24,15 @@ func (p *program) Start(s service.Service) error {
 	// Start should not block.
 	logger.Info("Nebula service starting.")
 
-	config := nebula.NewConfig()
+	l := logrus.New()
+	l.Out = os.Stdout
+
+	config := nebula.NewConfig(l)
 	err := config.Load(*p.configPath)
 	if err != nil {
 		return fmt.Errorf("failed to load config: %s", err)
 	}
 
-	l := logrus.New()
-	l.Out = os.Stdout
 	p.control, err = nebula.Main(config, *p.configTest, Build, l, nil)
 	if err != nil {
 		return err

cmd/nebula/main.go

@@ -40,15 +40,16 @@ func main() {
 		os.Exit(1)
 	}
 
-	config := nebula.NewConfig()
+	l := logrus.New()
+	l.Out = os.Stdout
+
+	config := nebula.NewConfig(l)
 	err := config.Load(*configPath)
 	if err != nil {
 		fmt.Printf("failed to load config: %s", err)
 		os.Exit(1)
 	}
 
-	l := logrus.New()
-	l.Out = os.Stdout
 	c, err := nebula.Main(config, *configTest, Build, l, nil)
 
 	switch v := err.(type) {