unclear error message when detaching volume we booted from

[Dafna Ron]

If I boot an instance from a volume and than try to detach the volume this is the warning I get:
 You have selected "vda on instance Dafna". Please confirm your selection. This action cannot be undone.

If we consider that not all user's will be familiar with linux they may not understand that vda in this warning means boot disk.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/76133

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/76133
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=bc8aa9ed519f9e9d9d0a9e18fe6d64585b3111a7
Submitter: Jenkins
Branch: master

commit bc8aa9ed519f9e9d9d0a9e18fe6d64585b3111a7
Author: liyingjun <email address hidden>
Date: Sat Feb 22 00:24:04 2014 +0800

    More clear message when detaching volume

    When detaching a volume from instance, the warning message looks like:
    You have selected "/dev/vdb on instance test". Please confirm your
    selection. This action cannot be undone.
    If we consider that not all user's will be familiar with linux they may
    not understand that vda in this warning means boot disk.
    So use "volume abc on instance test" like message instead of the origin
    one.

    Change-Id: If1f7a161dfbc71ed22d286c65520b1500fb3a729
    Closes-bug: 1281679