[NOP] removed dead code

A very nice design pattern:

atomReactorObservable.addListener(xzy)

notify xzy: reactor is going to explode

xzy ... veto the change ... an exploding
nuclear reactor may cause harm to human kind ...

Well ok this was ironic, but there does not exist any
kind of code in the Saros business logic that is able to
"rollback" the state, so the code provided by the classes
is pretty useless.

Change-Id: Iab8a7b95e4ac92cf6fcf2e78e08c9f2922448e39
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1412
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>