Cleanup cluster feature branch

[jafcrocker]

Cleanup to feature/cluster branch required before merging:

• Cluster does not restart after shutdown. "hostname -f" fails. https://gist.github.com/jafcrocker/d243840e1b7df3d18811
  This is a problem with the way that we do the /etc/hosts file. The file is not available until vagrant mounts /vagrant directory, but we need it before that.
• The vagrantfile is getting too big - we should split out the bash initialization into a separate file instead of embedding it in the Vagrantfile.
• We write into .bashrc, but code is not idempotent, so we add the same changes each time we bring up the vm. That SCRIPT should probably be added as /etc/init.d/first-boot.sh which would need to remove itself after running
• fix 'zendev box' to properly create btrfs volumes
• add --cpus and --fssize to cluster and box