[REFACTOR] renamed ProcessListener

Renamed to NegotiationListener. Also renamed parameters of this
interface.

Change-Id: I48ee2bb5437ffab44cb4127731fc86f45b5eb64c
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1937
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>