The value of the object tmnxDhcpSvrPoolOptionType specifies
how the value of this option in stored in tmnxDhcpSvrPoolOptionValue.
The value of this object cannot be set to 'domain (5)' when the value
of tmnxDhcpServerCfgAddrType is set to 'ipv4(1)'.
This object is mandatory at creation time.