In order to support remote-managed ports the following is needed:
* Nova compute driver needs to support this feature;
* For the Libvirt compute driver, a given host needs to have the right
version of Libvirt - the one which supports PCI VPD (7.9.0
https://libvirt.org/news.html#v7-9-0-2021-11-01).
Therefore, this change introduces a new capability to track driver
support for remote-managed ports.
Change-Id: I7ea96fd85d2607e0af0f6918b0b45c58e8bec058