* change HostAliases to put all aliases for an IP
  on the same line in /etc/hosts rather than writing
  one line per IP-alias pair
* having multiple entries in /etc/hosts for the same IP
  causes issues with DNS resolution for some software
* https://unix.stackexchange.com/questions/102660/hosts-file-is-it-incorrect-to-have-the-same-ip-address-on-multiple-lines