Removed unused variables when able and updated to the new ironic driver
definitions found here.
https://docs.openstack.org/ironic/latest/admin/upgrade-to-hardware-types.html
The intention is to support the drivers via profiles, so the table from
the above link was converted to a dictionary. This dictionary was used
as a source when combining / concatenating the various drivers for each
profile into a usable list. The standalone logic was simplified.
Change-Id: I19553af41b5e669386b855209c61235bf37371f2
Closes-Bug: 1758351
fc1e4f78dc