Opennebula aii

- removed some comments
- included post_reboot hook to install acpid
- removed hardcoded sleep time
- aii remove function bug fixes
i consider it on the same level as freeipa hooks, so not releasing it for now is ok for me. what is this quattor externals repo you speak of? http://quattor.web.lal.in2p3.fr/packages/quattor/externals/ ?