Opennebula aii

- removed some comments
- included post_reboot hook to install acpid
- removed hardcoded sleep time
- aii remove function bug fixes
If it stops and removes VMs, state it in the name of the function:

```perl
sub stop_and_remove_one_vms {
...
```
or something like that.

In general, method and function identifiers should be verbs (they ARE verbs in imperative languages), excepting when they are explicitly predicates.