Comment 15 for bug 1783342

Reviewed: https://review.openstack.org/631646
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-openstack_hosts/commit/?id=cac9033c84a669eca5b8fbdb15c124f97c812db1
Submitter: Zuul
Branch: stable/ocata

commit cac9033c84a669eca5b8fbdb15c124f97c812db1
Author: Jean-Philippe Evrard <email address hidden>
Date: Tue Jul 24 16:21:34 2018 +0200

    Do not install linux-image-extra by default

    In Ubuntu 14.04, the kernel shipped was lightweight, and some
    extra features like using vhost_net, required the package
    linux-image-extra.

    In Ubuntu 16.04 and above, this is not the case anymore,
    as many kernel packages ship with extra features.

    vhost_net is generally shipped with the kernel package nowadays
    and was the only one documented for the addition of the
    linux-image-extra into our roles.

    Change-Id: I579484ccefe0f29c40f8fed4b2d1b73aaeb917b1
    Closes-Bug: 1783342
    (cherry picked from commit 8c46d189889987148d6f6906ef2ea66c17f69bed)