firewallrule.go
func (c *Client) CreateFirewallRule(dcID string, serverID string, nicID string, fw FirewallRule) (*FirewallRule, error) {
	url := fwruleColPath(dcID, serverID, nicID) + `?depth=` + c.client.depth + `&pretty=` + strconv.FormatBool(c.client.pretty)
	ret := &FirewallRule{}
	err := c.client.Post(url, fw, ret, http.StatusAccepted)
	return ret, err
}
func (c *Client) CreateFirewallRule(dcID string, serverID string, nicID string, fw FirewallRule) (*FirewallRule, error) {
	url := fwruleColPath(dcID, serverID, nicID) + `?depth=` + c.client.depth + `&pretty=` + strconv.FormatBool(c.client.pretty)
	ret := &FirewallRule{}
	err := c.client.Post(url, fw, ret, http.StatusAccepted)
	return ret, err
}
//CreateFirewallRule creates a firewall rule