docs: def selectPeerToIntroduce(self, otherPeers):
          """
          Choose a peer to introduce.  Return a q2q address or None, if there are
          no suitable peers to introduce at this time.
          """
          for peer in otherPeers:
              if peer not in self.otherPeers:
                  self.otherPeers.append(peer)
                  return peer