code: func (pis PeerIdentitySet) ByID() map[string]PeerIdentityInfo {
  	m := make(map[string]PeerIdentityInfo)
  	for _, id := range pis {
  		m[string(id.PKIId)] = id
  	}
  	return m
  }
docs: // ByOrg sorts the PeerIdentitySet by PKI-IDs of its peers