swarm: fix emission of newInteraction signal
swarm: fix emission of newInteraction signal

newInteraction signal should not be emitted for already added interaction

Change-Id: I6c5fc7ccce206be1091aefb09d9ce71e1211d873

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc