Add support for specifying disk bus and device type when attaching volumes

[Nikola Đipanov]

When completing https://blueprints.launchpad.net/nova/+spec/use-new-bdm-format-in-attach BP, changes that will enable users to use it through python-novaclient were not done.

python-novaclient should provide the possibility to optionally pass disk bus and device type with the volume-attach command.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/99577

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/99577
Committed: https://git.openstack.org/cgit/openstack/python-novaclient/commit/?id=2b54bbc8bb7e6cce49e570b534ba78baeb811e75
Submitter: Jenkins
Branch: master

commit 2b54bbc8bb7e6cce49e570b534ba78baeb811e75
Author: vagrant <email address hidden>
Date: Thu Jun 12 06:45:55 2014 +0000

    add disk bus and device type to volume attach

    This change adds the optional parameters: disk bus and device type
    to the volume-attach command for the V3 API.

    DocImpact
    Closes-Bug: #1303875

    Change-Id: I4fd07726887d08e5b669139b559bdb2c2d21826e