Minor rephrasing of errors / logs

- Use "failed to", as it's used in many other locations,
  so more consistent
- Removed "Swarm successfully ...", as it should be clear
  from the rest of the message

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

node/node.go

@@ -274,10 +274,10 @@ func (n *Node) currentRole() api.NodeRole {
 // configVXLANUDPPort sets vxlan port in libnetwork
 func configVXLANUDPPort(ctx context.Context, vxlanUDPPort uint32) {
 	if err := overlayutils.ConfigVXLANUDPPort(vxlanUDPPort); err != nil {
-		log.G(ctx).WithError(err).Error("Configuring VXLAN port failed")
+		log.G(ctx).WithError(err).Error("failed to configure VXLAN UDP port")
 		return
 	}
-	logrus.Infof(" Swarm successfully initialized VXLAN UDP Port to %d ", vxlanUDPPort)
+	logrus.Infof("initialized VXLAN UDP port to %d ", vxlanUDPPort)
 }
 
 func (n *Node) run(ctx context.Context) (err error) {