[XNIO-191] At FramedMessageChannel, add correct treatment for reading messages into buffers that are smaller than the length of a message.
- the messages are truncated
- the actual length of the message being truncated is returned
Implement SSL conduits and connections. Plus:
- update and increment the tests to reflect the changes in the API (namely connections and conduits)
- small fixes
Delete JsseAcceptingSslStreamChannel and JsseConnectedSslStreamChannel.