Those functions were part of the neutron devstack plugin but we
discussed it during last PTG [1] and decided to move to the Devstack
repo as plugins which are used by e.g. CI jobs which are defined outside
of the neutron repository.
Placement integration is used e.g. in the tempest-slow job which is
defined in tempest and used by many different OpenStack projects.
[1] https://etherpad.opendev.org/p/neutron-yoga-ptg#L142
Depends-On: https://review.opendev.org/c/openstack/devstack/+/815682
Change-Id: I72e2c4c55a3c40e2a3c491fe66c05b659b76e349
6c9bf1efbd