Update websockify, fix websocket tests, refactor websocket harness.

- pull in websockify c00c0eed from
  https://github.com/kanaka/websockify with one-shot socket listener
  cleanup and other misc updates.
- import the WebSocketProxy class directly and launch it one-shot
  using the run_once parameter rather than spawning a separate
  websockify via shell.
- create a python version of socket_server.sh and in the harness and
  remove socket_server.sh.
- refactor clean_pids to use a two phase cleanup where it sends
  a SIGTERM (to give the parent the chance to cleanup children) and
  then send a SIGTERM 1 second later. This still has risk of leaving
  child processes around (for example, the nc process in the original
  socket_server.sh which would also hold onto the listen port).

Conflicts:

	tests/runner.py

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