Adds create backup server extension for the V3 API

[OpenStack Infra]

https://review.openstack.org/62280
commit d94203beb4a93b613f0a42d0220659be3abdd8e5
Author: Chris Yeoh <email address hidden>
Date: Mon Dec 16 12:29:57 2013 +1030

    Adds create backup server extension for the V3 API

    Moves create_backup functionality out of admin_actions
    into its own extension. This is part of blueprint v3-admin-actions-split
    which allows more selective enablement of features contained
    in the admin actions extension.

    Note that XML api samples are no longer generated because bp
    remove-v3-xml-api has been approved.

    Partially implements bp v3-api-admin-actions-split
    DocImpact: Adds os-create-backup extension and moves the
    create_backup functionality out of os-admin-actions into
    this new extension.

    Change-Id: I4858a06df20c552bd55ff2841adbcfc761304f42

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/172762

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/172762
Committed: https://git.openstack.org/cgit/openstack/api-site/commit/?id=0c04b6cabeef94179d0b57cd5132bbb6ac51d672
Submitter: Jenkins
Branch: master

commit 0c04b6cabeef94179d0b57cd5132bbb6ac51d672
Author: Diane Fleming <email address hidden>
Date: Sun Apr 12 17:53:25 2015 -0500

    Move os-create-backup to its own extension for Compute API v2.1

    Change-Id: I358043a1f288dd4858a523e931cbf9790ff64288
    Closes-Bug: #1286950