Add support for volume affinity across different backends

Registered by Nodir Kodirov

Existing affinity filters make volumes affine (or anti-affine) only within the same backend. It is not possible to have a volume on HDD backend affine (or anti-affine) with a volume on SSD backend. This change removes this limitation by introducing another Cinder filter.

Blueprint information

Status:
Not started
Approver:
Sean McGinnis
Priority:
Undefined
Drafter:
Nodir Kodirov
Direction:
Needs approval
Assignee:
None
Definition:
Pending Approval
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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