Comment 4 for bug 1585325

Reviewed: https://review.openstack.org/323654
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-os_nova/commit/?id=066012914eb9c41d8f43600198704007d5c04fd6
Submitter: Jenkins
Branch: stable/mitaka

commit 066012914eb9c41d8f43600198704007d5c04fd6
Author: Matthew Thode <email address hidden>
Date: Tue May 24 13:58:18 2016 -0500

    Create symlink for libvirt save directory

    Nova can fill up the partition that /var/lib/libvirt/qemu/save is on
    when nova calls `image-create` on an instance. This occurs because
    nova calls libvirt with managedsave which creates a temporary file in
    the /var/lib/libvirt/qemu/save location. Libvirt does not allow the
    location of /var/lib/libvirt/qemu/save to be configurable so we have
    to manage it ourselves via bindmounts or symlinks.

    In this commit we remove the /var/lib/libvirt/qemu/save directory and
    create a symlink in it's place, pointing to
    `{{ nova_system_home_folder }}/save` instead (which we also create).
    This location was chosen as deployers often have more space here for
    nova instances.

    Change-Id: I5c96f70aa355cc02379fe7e0681416eca53447eb
    Partial-Bug: #1585325
    (cherry picked from commit 2599006a81eeb2632a87f5b00d27d5f061f7d14e)