Enable add ephemeral disk when resize

Registered by jichenjc

Currently we allow resize an instance to a flavor with bigger ephemeral
disk size. However, if the previous disks are created through
--ephemeral parameter, the resize operation will not affect them and
user have no way to update those disks.

https://review.openstack.org/#/c/145736/

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
jichenjc
Direction:
Needs approval
Assignee:
jichenjc
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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