Add API validation schema for volume_attachments

[OpenStack Infra]

https://review.openstack.org/137513
commit 9ff1a56c61cf75aab0b9aa9cd73b1ef547a8478b
Author: ghanshyam <email address hidden>
Date: Thu Nov 27 14:11:36 2014 +0900

    Add API validation schema for volume_attachments

    This patch adds API validation schema for volume_attachments.

    Update volume required only Volume Id in request body but sample
    files used to pass 'device' also.
    This patch also correct those API sample files-
    doc/v3/api_samples/os-volumes/update-volume-req.json
    nova/tests/functional/v3/api_samples/os-volumes/update-volume-req.json.tpl

    DocImpact

    Partially implements blueprint v2-on-v3-api

    Change-Id: I489272528fe4f4c43ab781d6a1a46742b1702c76

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/209764

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/209764
Committed: https://git.openstack.org/cgit/openstack/api-site/commit/?id=6f62364db4c8e59a060d15dcafc560f3dca02a4a
Submitter: Jenkins
Branch: master

commit 6f62364db4c8e59a060d15dcafc560f3dca02a4a
Author: Atsushi SAKAI <email address hidden>
Date: Thu Aug 6 14:54:15 2015 +0900

    Modify request body sample of volume_attachments

    Modify request body sample, since only "volume ID" is required.
    but "device" is not needed

    Change-Id: Iad205303824bed051481715ab509bfc077767801
    Closes-Bug: #1399060