Simplify/fix config enabled conditions for upgrades

Simplify/fix config enabled conditions for upgrades

We should enable each kind of upgrade per role, not per step
so rework the conditions, and also only apply it to the deployment
(to save the round-trip to the nodes applying an empty config)
but don't disable the *Config resources as the overhead of these
is small, and we reference the Step1 config in the outputs, even
if it's empty.

Change-Id: Iee2f1fb5b1d8b0b6001c6ab0f2a4ef2858cef281
Partially-Implements: blueprint overcloud-upgrades-per-service