special ssl protocol version for compatible with test ws client

[marx-yu]

when use jetty9, the default ssl version is sslv3, can't compatible with test ws client
so change in WebSocketServerMaxConnsTest_SingleThread.java, add two lines on 213,214:
factory.getSslContextFactory().setTrustAll(true);
factory.getSslContextFactory().addExcludeProtocols("SSLv2Hello","SSLv3");