Block additionalProperties on Nova API tests

Now Nova team is allowing additional properties with microversions
only, that means Nova v2 and v2.1 should not contain additional
properties forever. In addition, we should not allow vender-specific
properties for OpenStack interoperability.
This patch disables additionalProperties for blocking such properties
for v2 and v2.1 API.

Change-Id: Ica929c402a3d042ae751302384e68853eb28b405
27 files changed