net: Defer reading until listeners could be added

Defer reading until user-land has a chance to add listeners. This
allows the TLS wrapper to listen for _tlsError and trigger a
clientError event if the socket already has data that could trigger.

Fixes: https://github.com/nodejs/io.js/issues/1114
PR-URL: https://github.com/nodejs/io.js/pull/1496


Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>