Placement is now a separate service and has been removed from nova[1]
and implemented as a separate service in OSA[2]. As such, the nova
in-tree placement API is now disabled and can be removed.
[1] https://review.opendev.org/#/c/618215/
[2] https://review.opendev.org/#/c/656891/
Depends-On: I01df855d8b9255d24efe16ab053ffa491fda351f
Depends-On: I25ce79b9e3492cb075c50beed90ea2b78055e474
Change-Id: I2f5d4c2f1fc1418bc4f4c4baa1ce3c90b88208fc