• httpd scoreboard fixups: scoreboard handles are still updated on the main
  connection from all stream request incoming from it, since it is not trivial
  to get new handles for h2 workers. Updating of scoreboard status has been
  improved. mpm_worker recommended as the most stable configuration at the moment.
• some refacoring to isolate tls/alpn/upgrade code
• adding php-wrapper script to distribution, was missing