Allow users of manila-image-create pick the filesystem they want in their image

[Victoria Martinez de la Cruz]

Current bash wrapper doesn't allow users to pick which filesystem to pack in the resulting image from the image creation process. Therefore, generated images include bytes that are not required, making the image bigger than needed unnecessarily. It would be nice to have a way of specifying which distro (for now, only Ubuntu) and which filesystem is desired.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/400411

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/400411
Committed: https://git.openstack.org/cgit/openstack/manila-image-elements/commit/?id=ac84122598432fa1030a345e2b3b8caa193d6c96
Submitter: Jenkins
Branch: master

commit ac84122598432fa1030a345e2b3b8caa193d6c96
Author: Victoria Martinez de la Cruz <email address hidden>
Date: Mon Nov 21 18:11:35 2016 -0300

    Enables end user to pick share protocol

    This patch set refactors manila-image-create script to allow
    end users to pick which share protocol install on their images.
    This change slightly affects the current behavior of the script.

    If an image is created using tox -e buildimage (as stated by current
    docs) an Ubuntu Trusty Minimal image with NFS will be created.

    Now, calling manila-image-create with params, will generate an image with
    the filesystem protocol desired.

    Change-Id: I0419cbf9a39290d32409f7a5ab9dfaf5ca636bb7
    Closes-Bug: #1643034