libvirt._create_image is too large and not tested

[Sahid Orentino]

We need to split this method is several small and add tests.

[Sahid Orentino (sahid-ferdjaoui)]

https://review.openstack.org/#/c/68604/

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/77593

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/68604
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=b1a8b39bfb13602556bbb2c3cb3d93673393f947
Submitter: Jenkins
Branch: master

commit b1a8b39bfb13602556bbb2c3cb3d93673393f947
Author: Sahid Orentino Ferdjaoui <email address hidden>
Date: Mon Mar 3 13:13:19 2014 +0100

    Add helper method for checking if VM is booting from a volume

    Add a _is_booted_from_value method which determines whether
    the disk mapping indicates that the VM is booting from a volume
    Update the _create_image method to use this helper API.

    Related-Bug: #1271528
    Change-Id: Iaa92f84ad3de9e84ba49bb255add043f3c8e4c8f

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/77593
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a4a19293f82255cf98d3239fbf1f16bcb410143c
Submitter: Jenkins
Branch: master

commit a4a19293f82255cf98d3239fbf1f16bcb410143c
Author: Sahid Orentino Ferdjaoui <email address hidden>
Date: Mon Mar 3 15:06:33 2014 +0100

    Add helper method for injecting data in an image

    Add a _inject_data method whish helps to injecting data
    in a disk image file system.
    Update the _create_image method to use this helper

    Change-Id: Ia005eee0a34d77bbf3eb33f7fef231dcf1eabe2c
    Related-Bug: #1271528