[INTERNAL] clean up AwarenessInformationCollector class

Changed visibility, removed dead code and addressed a TODO.

This currently changes the behavior how a project negotiation is
displayed. It is now no longer displayed. This can be reimplemented if
we can ensure that we can really observe a project negotiation and not
only pull the current state.

Change-Id: I9f78c0f06edb3cb6e4eee25ebee141e90b25f9c8
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1636
Tested-by: Jenkins CI
Reviewed-by: Damla Durmaz <ddurmaz88@gmail.com>
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>