Comment 6 for bug 1693679

Reviewed: https://review.openstack.org/474029
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=2a113159c00b51215f3506a9e9834fa7cc0d5ffb
Submitter: Jenkins
Branch: stable/ocata

commit 2a113159c00b51215f3506a9e9834fa7cc0d5ffb
Author: Rikimaru Honjo <email address hidden>
Date: Fri May 26 14:04:44 2017 +0900

    Calculate stopped instance's disk sizes for disk_available_least

    disk_available_least is a free disk size information of hypervisors.
    This is calculated by the following fomula:

    disk_available_least = <free disk size> - <Total gap between virtual
    disk size and actual disk size for all instances>

    But stopped instance's virtual disk sizes were not calculated
    after merging following patch in Juno cycle:
    https://review.openstack.org/#/c/105127

    So disk_available_least might be larger than actual free disk size.
    As a result, instances might be scheduled beyond the actual free
    disk size if stopped instances were on a host.

    This patch fix it.
    Stopped instance's disks will be calculated after merging this patch.

    Change-Id: I8abf6edfa80e3920539e4f6d4906c573f9543b91
    Closes-Bug: #1693679
    (cherry-picked from commit 3342215034c7a7a938c497c39f6405763201a261)