replay: only append the message if it isn't present in the replay
replay: only append the message if it isn't present in the replay

pombredanne/fedmsg,fedora-infra/fedmsg,pombredanne/fedmsg,maxamillion/fedmsg,fedora-infra/fedmsg,mathstuf/fedmsg,cicku/fedmsg,vivekanand1101/fedmsg,mathstuf/fedmsg,maxamillion/fedmsg,vivekanand1101/fedmsg,cicku/fedmsg,cicku/fedmsg,mathstuf/fedmsg,vivekanand1101/fedmsg,fedora-infra/fedmsg,chaiku/fedmsg,pombredanne/fedmsg,maxamillion/fedmsg,chaiku/fedmsg,chaiku/fedmsg