tty: do not add `shutdown` method to handle

UV_TTY does not support `uv_shutdown()` so adding this method in
StreamBase will cause an `abort()` in C land.

Fix: https://github.com/iojs/io.js/issues/1068
PR-URL: https://github.com/iojs/io.js/pull/1073


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>