Comment 4 for bug 1628842

Reviewed: https://review.openstack.org/395648
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=fd2e2fa310890a8614db7f8c5e0e1f9037d5d14c
Submitter: Jenkins
Branch: stable/newton

commit fd2e2fa310890a8614db7f8c5e0e1f9037d5d14c
Author: Pavlo Shchelokovskyy <email address hidden>
Date: Wed Oct 5 14:49:13 2016 +0300

    [install-guide] describe service clients auth

    Currently install guide incorrectly advises operators to configure
    access for service users used by ironic-conductor in
    [keystone_authtoken] section.

    Such way of configuration was deprecated in Newton release, and using it
    will result in a warning log message.

    This patch changes the advised way of configuring service users to an
    appropriate one using config sections corresponding to each service client
    to be used, as well as proper options for keystoneauth plugins and
    sessions instead of legacy options.

    Change-Id: I96967682f18988d9e32f2ecfa7792aa0e653db3f
    Closes-Bug: #1628842
    (cherry picked from commit 492e67a64d058265683d695a07e47d5c75856cac)