[LOG] added log statements to the BinaryChannelConnection class

I am still impressed about the traffic size ... up to 0.5 kb for a
single checksum activity.

Change-Id: I305b1508b7f3dc36f0ba600b7e7fbda8e584ad34
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1215
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>