Moved ServerChannelListener to ConfigurableServerChannel to avoid that superclass depends on subclass.
Defaulting maxServerInterval to -1, that is to never sweep if the /meta/connect is being processed on server.
Using org.junit.Assert instead of junit.framework.Assert.
Refactored tests to allow better option customization.
Fixes COMETD-414 (Possible race condition in sweeping).

Now the reconnect:"none" advice is only sent if the session
has been explicitly disconnected, rather than swept.
Updated Jetty to 7.6.10.