QPID-4905: Tidy up
- Remove unused function getBuffered() of ConnectionOutputHandler
- Stop SessionContext and AggregateOutput from needlessly implementing
  the OutputControl interface

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1489457 13f79535-47bb-0310-9956-ffa450edef68
QPID-4854: Make the protocol negotiation timeout actually relate to
the protocol negotiation!

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1489458 13f79535-47bb-0310-9956-ffa450edef68