Apply read_write_timeout to Unix socket connections.

I noticed my Predis connections timing out on long running Unix socket connections even with read_write_timeout set to 0. It looks like it only gets set when using TCP connections.

I copied the code from the tcpStreamInitializer() method right above it which is not necessarily nice but gets the job done. Please bear with me if I missed something since this is my first contribution on GitHub ever. :)