code: def _get_host_only_ip():
      
      mac = _get_host_only_mac_address()
      ip_addr_show = check_output_demoted(['ssh', '-o', 'StrictHostKeyChecking=no',
                                           '-o', 'UserKnownHostsFile=/dev/null',
                                           '-i', _vm_key_path(), '-p', _get_localhost_ssh_port(),
                                           'docker@127.0.0.1', 'ip addr show'])
      return _ip_for_mac_from_ip_addr_show(ip_addr_show, mac)
docs: Determine the host-only IP of the Dusty VM through Virtualbox and SSH
      directly, bypassing Docker Machine. We do this because Docker Machine is
      much slower, taking about 600ms total. We are basically doing the same
      flow Docker Machine does in its own code.