Adds a new poll extension to provide get_hardware_info and get_node_info
interfaces.
get_hardware_info will be used for node validation by ironic deploy
drivers.
get_node_info will be used for sending lookup data to IPA.
standalone mode is assumed as debug only, but it's not the case
considering the poll mode will be introduced, slightly updates the
description, also prevents the mdns lookup when standalone is true.
Story: 1526486
Task: 28724
Change-Id: I5ad772a18cc4584585c5a7b6fb127547cece1998