Comment 7 for bug 1823044

Reviewed: https://review.openstack.org/651474
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=16e982401191602efaf1c034b8fe645d62e7181e
Submitter: Zuul
Branch: stable/stein

commit 16e982401191602efaf1c034b8fe645d62e7181e
Author: Mark Goddard <email address hidden>
Date: Wed Apr 3 17:33:04 2019 +0100

    Use ironic inspector 'dnsmasq' PXE filter by default

    With Docker CE, the daemon sets the default policy of the iptables
    FORWARD chain to DROP. This causes problems for provisioning bare metal
    servers when ironic inspector is used with the 'iptables' PXE filter.
    It's not entirely clear why these two things interact in this way,
    but switching to the 'dnsmasq' filter works around the issue, and is
    probably a good move anyway because it is more efficient.

    We have added a migration task here to flush and remove the ironic-inspector
    iptables chain since inspector does not do this itself currently.

    Change-Id: Iceed5a096819203eb2b92466d39575d3adf8e218
    Closes-Bug: #1823044
    (cherry picked from commit 86e83faeb1fd088d44c5108a5ec835eba6316b2d)