[Client] Connectors do not honor /etc/hosts #88

Originally reported 2015-05-31 by @clue: reactphp-legacy/socket-client#35

There's currently no way to connect to "localhost" or any other host names listed in the local /etc/hosts file. We could provide a hard-coded default for some common host names (like "localhost"), but this is bound to break.

In particular, this also affects usage with linked Docker containers where one container references another container by its host name. This means that there's currently no way to connect to other containers by their name.

Opening this ticket as a reminder - this actually depends on reactphp/dns#10