code: func (r Network_Gateway) ChangeGatewayVersion(versionId *int) (resp bool, err error) {
  	params := []interface{}{
  		versionId,
  	}
  	err = r.Session.DoRequest("SoftLayer_Network_Gateway", "changeGatewayVersion", params, &r.Options, &resp)
  	return
  }
docs: // Used to create a transaction to upgrade or rollback the vSRX version for Juniper gateway.
  //
  //