Partially revert "Set resource class during upgrade"
Partially revert "Set resource class during upgrade"

This reverts part of commit 30bc3c0933a1072e5e4c48b4614f5f387ffd8327.
On master, when upgrading from pike to queens in grenade, we already
create all the nodes with a resource class being set, so no need to
update it. We still pass the parameters to verify and verify_noapi as
that's what grenade does.

Change-Id: Ic7c3218fe95ef9f73d358216831158a1ec025fba

openstack/ironic,pshchelo/ironic,pshchelo/ironic,openstack/ironic