Typo
I think it's configurable already
fabfile: always add user to wheel

Even if the user account existed already.
fabfile: use fabric.contrib.files
Add command for launching virt-viewer
Don't try another configuration if task succeeds

The behaviour is still not good: if there's multiple provisioning
configurations and we run a list of tasks specified on the command line
and only some of the tasks succeed, the whole list is re-run under the
next configuration, which is IMO not right.
Add 'fab' alias for provision command

It's short and I don't really know what provisioning means.