clean test server a bit

Signed-off-by: Andy Green <andy.green@linaro.org>
move bind passphrase out of LWS_NO_SERVER

Signed-off-by: Andy Green <andy.green@linaro.org>
test echo initialize listen port

Signed-off-by: Andy Green <andy.green@linaro.org>
remove duplicate const

Signed-off-by: Andy Green <andy.green@linaro.org>