ALLJOYN-2096 Update SConscript to copy connectionless chat java sample to the build directory.

Change-Id: Ia137d57d6ef0cdeae0a6312cad5a28780909c6ac
ALLJOYN-2148 Make BusAttachment.ShutdownHook and busAttachmentSet private.

Change-Id: Iafd50d8ffccee6e0684078742648ba07bcbb7199