[INTERNAL] fix for commit 619850edb30565899843cb381afa2f57d8a40e9b

getConnectionIdentifier returned the negotiationID for
non response connection requests.

Change-Id: I4bca8f12a7825681743af136b49010d5fb506df9
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/961
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>