Volume retype list should not contain the current volume_type

[Zhenguo Niu]

Instead of adding an extra check and throw an error message when retype volume_type is same with the current one, we should exclude it form the choice list.

[Zhenguo Niu (niu-zglinux)]

https://review.openstack.org/#/c/188354/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/188354
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=03308e68639d99e01c55114ed2948cf443c73aeb
Submitter: Jenkins
Branch: master

commit 03308e68639d99e01c55114ed2948cf443c73aeb
Author: Zhenguo Niu <email address hidden>
Date: Thu Jun 4 19:36:43 2015 +0800

    Exclude current volume_type from Volume retype list

    Instead of adding an extra check and throw error messages when
    the new volume_type is same with the current one, we should
    exclude it from the choices list.

    Change-Id: Id91c42ed4a73cc7d5aca34242bf4457a58e8496c
    Closes-Bug: #1461856