Nested allocations are only partially supported in nova-manage placement
heal_allocations CLI. This patch documents the missing support and
blocks healing instances with VGPU or Cyborg device profile request in
the embedded flavor. Blocking is needed as if --forced is used with such
instances then the tool could recreate an allocation ignoring some of
these resources.
Change-Id: I89ac90d2ea8bc268940869dbbc90352bfad5c0de
Related-Bug: bug/1939020
59c2262ca5