[fuel-octane]Need to specify in docs that first of all we need to upgrade primary cic

[Sergey Murashov]

Need to specify that first of all we need to upgrade primary cic otherwise we can get the case when we have 2 primary cics in new cluster

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/7.0
Review: https://review.openstack.org/239197

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/239197
Committed: https://git.openstack.org/cgit/openstack/fuel-docs/commit/?id=c5dffb4e8bb9533bdf2ba0c895ea1321f08a8b0a
Submitter: Jenkins
Branch: stable/7.0

commit c5dffb4e8bb9533bdf2ba0c895ea1321f08a8b0a
Author: Oleg Gelbukh <email address hidden>
Date: Sat Oct 24 21:24:25 2015 +0000

    Add note about upgrading primary controller first

    Primary controller usually has the lowest ID number of all controllers
    in the environment. Add note to select controller with minimal ID to
    upgrade first in Upgrade Environment section of the Operations Guide.

    Closes-bug: 1505641
    Change-Id: I35b8440b6a4655c197b2b694e26f6760e6adad11