Install Guide: cinder setup for ceilometer fixes

* openstack-cinder-volume should be restarted, not
  openstack-cinder-agent-central
* use 'ceilometer' instead of 'cinder' in the section id

Change-Id: Id9cbab26ed8aa9d09b98da93576ff7aad8c304b7
Closes-Bug: #1259456
backport: havana
(cherry picked from commit ed3357982cb994d730adb381b1313f3762335c23)
Merge "Install Guide: cinder setup for ceilometer fixes" into stable/havana