Support updating only volume type is_public status

Registered by Liyingjun

When updating only volume type is_public, error will be raised: `ERROR:
Specify either volume type name and/or description`. Adding a check that is_public is None,
the same way name and description do.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Liyingjun
Direction:
Needs approval
Assignee:
Liyingjun
Definition:
Obsolete
Series goal:
Proposed for mitaka
Implementation:
Started
Milestone target:
None
Started by
Liyingjun
Completed by
Sean McGinnis

Related branches

Sprints

Whiteboard

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

Gerrit topic: https://review.openstack.org/#q,topic:bp/only-update-volume-type-public,n,z

Addressed by: https://review.openstack.org/221562
    Fix updating only volume type is_public

(?)

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