Drop support for the os-floating-ips-bulk API which has been deprecated
since Newton:
Idca478c566f9a7b5b30a3172453ce7c66d9fd8f0
This API now returns a 410 response for all routes.
Unit tests are removed and the functional API sample tests are just
asserting the 410 response now.
The API sample docs are left intact since the API reference still builds
from those and can be considered more or less branchless, so people
looking at the API reference can apply it to older deployments of nova
before os-floating-ips-bulk was removed.
The release note added for previous nova-network API removals is
amended to note this additional change.
Part of blueprint remove-nova-network
Change-Id: I89d081108b398d8efba9636279088c61349b21e6
Depends-On: https://review.openstack.org/582945
823c4e840d