Minimum bandwidth allocation with placement

Add basic scenario test for placement based minimum bandwidth
allocation.

Change-Id: Ie274f199ce33199a6fc8c4d6846a853522a90d3a
Depends-On: https://review.openstack.org/574783
Depends-On: https://review.openstack.org/636360
Depends-On: https://review.opendev.org/660924
Depends-On: https://review.opendev.org/663270
Partial-Bug: #1578989
See-Also: https://review.openstack.org/502306 (nova spec)
See-Also: https://review.openstack.org/508149 (neutron spec)
4 files changed