[Broker-J] Deprecated methods in management-http / websocket plugin

In broker plugins management-http and websocket there is used Jetty class org.eclipse.jetty.util.ssl.SslContextFactory, which has few deprecated method used in broker code:

getNeedClientAuth()

setWantClientAuth()

Also usage of class org.eclipse.jetty.server.OptionalSslConnectionFactory is deprecated.

Deprecated methods should be replaced with the recommended ones.