func (c *ComputeUtil) startInstance() error {
	op, err := c.service.Instances.Start(c.project, c.zone, c.instanceName).Do()
	if err != nil {
		return err
	}

	log.Infof("Waiting for instance to start.")
	return c.waitForRegionalOp(op.Name)
}
func (c *ComputeUtil) startInstance() error {
	op, err := c.service.Instances.Start(c.project, c.zone, c.instanceName).Do()
	if err != nil {
		return err
	}

	log.Infof("Waiting for instance to start.")
	return c.waitForRegionalOp(op.Name)
}
// startInstance starts the instance.