Comment 2 for bug 1506398

Reviewed: https://review.openstack.org/237525
Committed: https://git.openstack.org/cgit/openstack/fuel-octane/commit/?id=6b0a7649cfcf546ffe410e62aaaaf72bec9e5c2d
Submitter: Jenkins
Branch: stable/7.0

commit 6b0a7649cfcf546ffe410e62aaaaf72bec9e5c2d
Author: Oleg Gelbukh <email address hidden>
Date: Tue Oct 20 11:22:12 2015 +0000

    Stop corosync in upgrade seed during control plane switch

    Stop corosync cluster before switching to upgraded control plane.
    Start corosync cluster once switch is complete.
    Don't stop cluster if there is only one controller in seed environment.

    Closes-bug: 1506398
    Change-Id: Ie5684155899675ce1c35636d9e892d399e41b790