net: Refactor to use streams2

This is a combination of 6 commits.

* XXX net fixup lcase stream

* net: Refactor to use streams2

    Use 'socket.resume()' in many tests to trigger old-mode behavior.

* net: Call destroy() if shutdown() is not provided

    This is important for TTY wrap streams

* net: Call .end() in socket.destroySoon if necessary

    This makes the http 1.0 keepAlive test pass, also.

* net wtf-ish stuff kinda busted

* net fixup