Fix "zombie" http output websocket connections #1
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At the moment http_server websocket implementation just writes to webscocket, and do not have a way to detect client disconnect proactively. More over, if client disconnects, and it fails write to it, it does not stop the handler, and continues to be inside the endless for loop, untill stream is stopped
for !h.shutSig.IsSoftStopSignalled() {.It cause issues when you have multiple clients connected/disconnected, because essentially it fanout using round robin to them, but if you have closed "zombie" connections, they will also consume events.