Setup nova-compute and fix OOO issues in site.yml

* Conductor needed installed first for `nova-manage db sync`.
* The nova-compute role isn't uploaded to galaxy, needed to manually
  git clone (for now)
* Still in the process of setting things up, not very functional.
Merge pull request #5 from retr0h/retr0h/setup-nova-and-ooo-issues

Setup nova-compute and fix OOO issues in site.yml