netutils/websocket: organizing code
netutils/websocket: organizing code

1. internal function name is changed:
   websocket_server_start() -> websocket_server_authenticate()
2. websocket_socket_free() is moved to common function area.
3. added comment about the difference between websocket_server_open()
and websocket_server_init()

Change-Id: I5b4e3e445ea2bafcac920955396fd54e51f87a54
Signed-off-by: bossjisu <800dec47d2987cee7cc3d7aee71bc11b56f5042e@samsung.com>

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