private ip option should enable network helper

Instances provisioned on accounts with the global network helper option
disabled will not automatically configure their private ip addresses.

Enable Network Helper in the Instance Config before booting the
instance when `--linode-create-private-ip` is used.

Closes #13

pkg/drivers/linode/linode.go

@@ -388,6 +388,7 @@ func (d *Driver) Create() error {
 	}
 
 	client := d.getClient()
+	boolBooted := !d.CreatePrivateIP
 
 	// Create a linode
 	createOpts := linodego.InstanceCreateOptions{
@@ -399,6 +400,7 @@ func (d *Driver) Create() error {
 		Image:          d.InstanceImage,
 		SwapSize:       &d.SwapSize,
 		PrivateIP:      d.CreatePrivateIP,
+		Booted:         &boolBooted,
 	}
 
 	if len(d.AuthorizedUsers) > 0 {
@@ -453,6 +455,27 @@ func (d *Driver) Create() error {
 		return err
 	}
 
+	if d.CreatePrivateIP {
+		log.Debugf("Enabling Network Helper for Private IP configuration...")
+
+		configs, err := client.ListInstanceConfigs(context.TODO(), linode.ID, nil)
+		if err != nil {
+			return err
+		}
+		if len(configs) == 0 {
+			return fmt.Errorf("Linode Config was not found for Linode %d", linode.ID)
+		}
+		updateOpts := configs[0].GetUpdateOptions()
+		updateOpts.Helpers.Network = true
+		if _, err := client.UpdateInstanceConfig(context.TODO(), linode.ID, configs[0].ID, updateOpts); err != nil {
+			return err
+		}
+
+		if err := client.BootInstance(context.TODO(), linode.ID, configs[0].ID); err != nil {
+			return err
+		}
+	}
+
 	log.Info("Waiting for Machine Running...")
 	if _, err := client.WaitForInstanceStatus(context.TODO(), d.InstanceID, linodego.InstanceRunning, 180); err != nil {
 		return fmt.Errorf("wait for machine running failed: %s", err)