Comment 4 for bug 1593703

Reviewed: https://review.openstack.org/331660
Committed: https://git.openstack.org/cgit/openstack/fuel-devops/commit/?id=c3105cfe4acd72d3a1f102e00e613de3e9aad3bd
Submitter: Jenkins
Branch: master

commit c3105cfe4acd72d3a1f102e00e613de3e9aad3bd
Author: Anton Studenov <email address hidden>
Date: Thu Jun 23 20:23:13 2016 +0300

    Allow to change boot order and close tray for Node

    - Added LibvirtNode.set_boot() - allows to set new boot
      order on node.
      example:
          node.set_boot(['cdrom', 'hd'])

    - Added Node.close_tray() - allows to close cdrom tray.
      (Closes trays of all cdrom devices on selected node)

    - Changed DevopsDriver.volume_upload - these changes allow to upload
      a new image to existing volume. If there is no enough space
      virStorageVol.resize will be called to increase size of the volume
      to be equal to size of the new image file.

    - Added new helper to support proper conversion from xml to string

    Change-Id: I9fb726f84d11b5d2d9d6a40ec4993ca5db520dbf
    Related-Bug: #1593703