All other API resources (ie. traits, resource_provider_traits and
resource_provider_inventories) we need to report on for minimum
guaranteed bandwidth have update methods that can be called in one go,
either because they have update-or-create or update-overrides-all
semantics. Here we add the 'ensure_resource_provider' method so
resource providers also have a similarly simple way of being kept in
sync. We also add 'update_resource_provider' as a pre-requisite. On
the side we also fix a little, silent unit test type error.
Change-Id: Ib615ceeb323970d179ffb3dee14e52cb40e73ae7
Partial-Bug: #1578989
See-Also: https://review.openstack.org/502306 (nova spec)
See-Also: https://review.openstack.org/508149 (neutron spec)
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