In Train [1] we deprecated support for compute drivers
that did not implement the update_provider_tree method.
That compat code is now removed along with the get_inventory
method definition and (most) references to it.
As a result there are more things we can remove but those
will come in separate changes.
[1] I1eae47bce08f6292d38e893a2122289bcd6f4b58
Change-Id: Ib62ac0b692eb92a2ed364ec9f486ded05def39ad