Clear up naming around zero address

net/swarm/swarm.go

@@ -128,7 +128,7 @@ func (s *Swarm) Dial(peer peer.Peer) (conn.Conn, error) {
 		Peerstore: s.peers,
 	}
 
-	// If we are attempting to connect to a loopback addr, fail out early
+	// If we are attempting to connect to the zero addr, fail out early
 	raddr := peer.NetAddress("tcp")
 	if raddr == nil {
 		return nil, fmt.Errorf("No remote address for network tcp")

util/util.go

@@ -115,7 +115,7 @@ func GetenvBool(name string) bool {
 // IsLoopbackAddr returns whether or not the ip portion of the passed in multiaddr
 // string is a loopback address
 func IsLoopbackAddr(addr string) bool {
-	loops := []string{"/ip4/127.0.0.1", "/ip6/::1", "/ip4/0.0.0.0"}
+	loops := []string{"/ip4/127.0.0.1", "/ip6/::1"}
 	for _, loop := range loops {
 		if strings.HasPrefix(addr, loop) {
 			return true