@param is_add - add the config if non-zero, else delete
@param want_dhcp_event - DHCP event sent to the sender
via dhcp_compl_event API message if non-zero
@param is_add - add the config if non-zero, else delete
@param want_dhcp_event - DHCP event sent to the sender
via dhcp_compl_event API message if non-zero