paths.go
func fwruleColPath(dcid, srvid, nicid string) string {
	return nicPath(dcid, srvid, nicid) + slash("firewallrules")
}
func fwruleColPath(dcid, srvid, nicid string) string {
	return nicPath(dcid, srvid, nicid) + slash("firewallrules")
}
// fwrule_col_path returns the string   "/datacenters/<dcid>/servers/<srvid>/nics/<nicid>/firewallrules"