Enable deleting of an in-use volume type

Registered by Tzach Shefi

As of today we can create a new Cinder volume without setting it's volume type, this means volumeType setting is optional.
If this is the case why can't we delete a volumeType even if it's being used by one or more volumes?
IMHO deleting a volumeType would just set volumeType fields to none on all the relevant volumes.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Tzach Shefi
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Sean McGinnis

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(smcginnis): Marking obsolete as this has been sitting out there for a long time. If this is still needed, please submit a new bp.

Could you provide concrete application scenarios and the benefits of we get from "force-delete" voluem type? --- ling-yun 2014-06-30

(?)

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