[Docs] Start ceilometer resource agents

[OpenStack Infra]

https://review.openstack.org/154906
commit ba1b2e5f2e763df0585a94f6cf04d582aa545221
Author: dtrishkin <email address hidden>
Date: Tue Feb 10 10:12:35 2015 +0300

    Start ceilometer resource agents

     * Ceilometer agent central and ceilometer alarm evaluator
       now start as resource agents of pacemaker
     * Disable upstart for this two services

     It does not make sense to have started ceilometer-central-agent
     without coordination, also it does not make sense to have
     started ceilometer-alarm-evaluator more than one per claster.
     This is disoriented users only. So here we enabled
     this services via pacemaker. This change should be
     present in 6.0 too.

    DocImpact

    Change-Id: Ic15a3bfb6238e4281b06aae0a3f9fe4abf96590d
    Closes-bug: #1418984
    Closes-bug: #1422403