Comment 4 for bug 1679522

Reviewed: https://review.openstack.org/453147
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=21c7651fe55d3737383de673d564b472da75e788
Submitter: Jenkins
Branch: master

commit 21c7651fe55d3737383de673d564b472da75e788
Author: Stanislaw Bogatkin <email address hidden>
Date: Tue Apr 4 15:05:46 2017 +0300

    Use intersection of added vs deleted nodes instead of just deleted ones

    There are cases when nailgun can send us data where there are nodes
    included into list of added nodes and deleted ones. As a result, puppet
    manifests failed with resource ensurance for present and absent hosts.
    To avoid this situation, subtract added nodes from deleted prior to
    actually deleting them from hosts.

    Change-Id: I515f7fae4bbe67123d70572a4f861e879ec580f6
    Closes-Bug: #1679522