Comment 5 for bug 1783342

Reviewed: https://review.openstack.org/587076
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-openstack_hosts/commit/?id=40c1e84c87e75cdcbf5b3603a907eb04c3fa452f
Submitter: Zuul
Branch: stable/queens

commit 40c1e84c87e75cdcbf5b3603a907eb04c3fa452f
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)