SslEngineConfigurator and SslContextConfigurator fix based on findbugs report
	+ formating and javadoc for the two classes
JDK client echo test moved to org.glassfish.tyrus.container.jdk.client package
TYRUS-317: Made WebSocketAddOn public to allow other developers use it in their GrizzlySeverContainer implementations.

- we should consider extending our GrizzlyServerContainer to allow more fine-grade configuration.