Revert "416812 Only start WebSocketContainer if enabled by attribute"

This reverts commit a1cba900c5266ddba97a58f0e67e55b35418fc7e.
Adding Example for javax.websocket Client use
416812 - Don't start WebSocketClient for every context

+ Lazy initializing WebSocketClient connection manager
  to avoid holding threads that the selector manager
  will allocate.
Undo temporary change for memory testing reasons