XD-717 Avoid duplicate data on XD shell console

- Set JLineLogHandler's 'suppressDuplicateMessages' flag to false to allow
  logger to display duplicate messsages on xd shell console
XD-715 Upgrade Lettuce and Netty
Enable save actions
XD-716 Fix hang on posting to HTTP source

- Make NettyHttpInboundChannelAdapter return Http
500 response if Message Consumer throws Exception

- Prevent Exception initializing Lettuce conn on I/O
thread by adding an ExecutionHandler to the
pipeline
Fix XD-673: http post 'target' is not mandatory