Completing the stack with dnsmasq, iptables, and mongo (or postgres).

- added private network iface in kitchen config
- dnsmasq replaces tftpd-hpa/xinetd for tftp
- dnsmasq also supplies dhcp and/or dns
- added iptables rules and sysctl modifications
- added mongo and stubbed out postgres support (requires upstream fixes)
- renamed 'hanlon-puma' -> 'hanlon'
- added rubocop config and applied most suggestions
- cleaned up dependencies
- moved hardcoded values to attributes
- properly set hanlon port to 8026