More basic install cleanup

* Make sure to apply the sysctl settings (restarting the network service
  isn't enough)
* Make sure that glance uses keystone for authentication
* Add a note about lost iptables rules after reboot
* Be more consistent with docbook tags
* Be more consistent with spacing
* Define the my_ip setting for nova nodes (the metadata service might
  not work properly if not defined)
* Use the controller IP addres to access horizon

Change-Id: I973624113d5b18ec8d53f6434a40f7250d91c04d