Linking to Vagrantfile less optimal, causing nodes to linger on for people like me

I placed all Vagrantfiles in environments/, each in their own subdirectory.

Why?
1. relink the Vagrantfile, if there are less nodes or different nodenames, you kinda lose the status of them and they are just lost in space. I could have made a wrapper around it... but I thought that was ugly and think this approach is better. 
2. linking is just not fun


One downside now is that pxc-bootstrap.sh fits 2 environments, so that's why I kept it in the root.


Kenny