Add missing quotation marks and move the cache vm to the ethernet bridge.

The latter you might not want - I can redo with just the syntax fix if that's the case. I found it useful since I then don't need another apt-cacher for other things. 

I don't know that there's a need for that third hostonly network. I was originally thinking it would be nat, deployment network, openstack internal, openstack external. Only the control node needs the external network, and even then I don't think it's testable at the moment.