refactor: Improve Ubuntu data MAC collection (#385)
refactor: Improve Ubuntu data MAC collection (#385)

Add '-n' dhclient option to client nodes running Ubuntu to speed up data
MAC address collection. This option prevents the interface from
accepting a DHCP lease (for some reason it causes 'dhclient' to hang in
RHEL).
open-power-ref-design-toolkit/cluster-genesis,open-power-ref-design-toolkit/cluster-genesis