Comment 7 for bug 1506041

Reviewed: https://review.openstack.org/256068
Committed: https://git.openstack.org/cgit/openstack/fuel-octane/commit/?id=b580f785cd0c27f1746fa441d6360dc98580c4eb
Submitter: Jenkins
Branch: stable/7.0

commit b580f785cd0c27f1746fa441d6360dc98580c4eb
Author: Oleg Gelbukh <email address hidden>
Date: Sat Nov 21 03:12:56 2015 +0000

    Add functions to set/unset upgrade_levels for compute service

    These functions set and unset upgrade_levels for the compute service
    in nova.conf file. It will be used to handle rolling upgrade of compute
    nodes as well as the cleanup of nova.conf once upgrade is finished.

    Related-bug: #1506041
    Co-Authored-By: Ilya Kharin <email address hidden>
    Change-Id: I4fcefae2051221ad220c0cb70226083060c5aa23
    (cherry picked from commit a17dba4c839318b4b36f447d134f4bea28213400)