examples/websocket: clean up the usage
examples/websocket: clean up the usage

This commit cleans up the websocket example usage and
improvement to check wrong input parameter.

Change-Id: I2b35bc3ecf03f1a26867a1d64de40783ea678ec8
Signed-off-by: Junyeon LEE <ddc45265127aa1feb4b01be10ec1f0d25d062d3d@samsung.com>

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