[fuel-octane] Octane doesn't handle upgrade_levels in nova.conf

I've found out that it doesn't work for 6.1 also (not only for 6.0).

Function below assumes that [upgrade_levels] already in place, which is not true.
=============
def add_compute_upgrade_levels(node, version):
    sftp = ssh.sftp(node)
    with ssh.update_file(sftp, '/etc/nova/nova.conf') as (old, new):
        for line in old:
            new.write(line)
            if line.startswith("[upgrade_levels]"):
                new.write("compute={0}\n".format(version))
=============

Fix proposed to branch: master
Review: https://review.openstack.org/321461

Reviewed: https://review.openstack.org/321461
Committed: https://git.openstack.org/cgit/openstack/fuel-octane/commit/?id=816c83eb36d6b94eb4f0602a62bf45684e31fc78
Submitter: Jenkins
Branch: master

commit 816c83eb36d6b94eb4f0602a62bf45684e31fc78
Author: Oleg Gelbukh <email address hidden>
Date: Thu May 26 10:28:22 2016 +0000

    Add upgrade_levels section to nova.conf if it is missing

    When no [upgrade_levels] section present in nova.conf file,
    fuel-octane should add it and set the upgrade levels. Otherwise,
    live migration is not possible for rolling upgrade scenario.

    Change-Id: I60e5f88beab3c5da039885522b17355cedde7582
    Closes-bug: 1583596

Fix proposed to branch: stable/8.0
Review: https://review.openstack.org/330609

Reviewed: https://review.openstack.org/330609
Committed: https://git.openstack.org/cgit/openstack/fuel-octane/commit/?id=2458dadd3ebf22432b8a45f66d801a6f1840a4b2
Submitter: Jenkins
Branch: stable/8.0

commit 2458dadd3ebf22432b8a45f66d801a6f1840a4b2
Author: Oleg Gelbukh <email address hidden>
Date: Thu May 26 10:28:22 2016 +0000

    Add upgrade_levels section to nova.conf if it is missing

    When no [upgrade_levels] section present in nova.conf file,
    fuel-octane should add it and set the upgrade levels. Otherwise,
    live migration is not possible for rolling upgrade scenario.

    Change-Id: I60e5f88beab3c5da039885522b17355cedde7582
    Closes-bug: 1583596
    (cherry picked from commit 816c83eb36d6b94eb4f0602a62bf45684e31fc78)

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/332931

Reviewed: https://review.openstack.org/332931
Committed: https://git.openstack.org/cgit/openstack/fuel-octane/commit/?id=24f3c396612eb0c69fbf06bab3cebbb9ca829426
Submitter: Jenkins
Branch: stable/mitaka

commit b34d749f1c281dafbdbf155bd86830dc8f2a9aa2
Author: Ilya Kharin <email address hidden>
Date: Wed Jun 22 21:10:56 2016 +0300

    Support mock==1.8.0 in unit tests

    Use assert_called_once_with instead of assert_called_once that was
    introduced in 2.0.0.

    Change-Id: Ifb7699d4b552d148984961727355f0e23b487c7c

commit d60f1905143bb7576ffd670595de1c4aeafd7b34
Author: Ilya Kharin <email address hidden>
Date: Wed Jun 22 02:01:52 2016 +0300

    Allow to authorize by the predefined admin_token

    The admin_token_auth middleware is added to keystone pipelines to
    allow authorization by admin_token.

    Change-Id: Ic03150305a669fad1446436a68051fb9aa25b892

commit cc7fab59f44ffef60285f8732d798f52469b2530
Author: Ilya Kharin <email address hidden>
Date: Wed Jun 22 01:47:01 2016 +0300

    Reset default_domain_id before the keystone task

    The default_domain_id should be removed from keystone.conf after restore
    of DB and before to apply the keystone puppet task to avoid of using the
    configured domain as a default.

    Change-Id: I05a6c48532e8042496b3d8ccef53d65bf8c44653

commit e3f82399d567dbcfc1ae9a1ecbddba7bf5028fc8
Author: Ilya Kharin <email address hidden>
Date: Wed Jun 22 01:32:47 2016 +0300

    Add helper function to iterate over parameters

    The helpers.iterate_parameters function allows to iterate over lines of
    INI-like files along with a context of information, such section,
    parameter and value.

    Change-Id: I55b179118116fd5dacf100754057ea6589782dc2

commit 5ed370a4fbb3369d0f75873d205ac7f0c655f93a
Author: Ilya Kharin <email address hidden>
Date: Wed Jun 22 01:18:05 2016 +0300

    Add update_file context manager for local files

    The subprocess.update_file function provides an ability to update
    content of a local file by iterating over lines of an original file and
    forming a result content in a temporary file to replace the original
    file in the end. This function is very useful to change configuration
    files.

    Change-Id: I433a5da67887b231400dd63131799019f45c277c

commit 58f31e6c5f408630c42565ee53de6b59457bc84c
Author: Oleg Gelbukh <email address hidden>
Date: Wed Jun 22 14:34:03 2016 +0000

    Escape passwords passed to openstack client

    If special symbols are used in password for 'admin' user in
    OpenStack, octane passes them to command line client as is
    and it breaks shell.

    Properly escape the password before passing it to subprocess.

    Change-Id: Iad635aec6d5b5cc32975937e00205b7e89dc99d9
    Closes-bug: 1585960

commit 896aba1191eeb59cf85cc8be6a2ae67e08b76070
Author: Yuriy Taraday <email address hidden>
Date: Wed Jun 22 15:28:45 2016 +0300

    Add absolute_import to util/docker.py to avoid local tempfile module

    Closes-Bug: 1595156
    Change-Id: I9484efce6fa7aec1b41cf592f9e9768d85931fa7

commit 46586a62df962b2ce00b5d8a63f6fd34c920a1f4
Author: Oleg Gelbukh <email address hidden>
Date: Thu M...