Split up metalistener, fix deadlock in accept routine, I think

metaaddr.go

@@ -0,0 +1,31 @@
+package meta
+
+import "net"
+
+// MetaAddr implements the net.Addr interface for a meta listener.
+type MetaAddr struct {
+	addresses []net.Addr
+}
+
+// Network returns the name of the network.
+func (ma *MetaAddr) Network() string {
+	return "meta"
+}
+
+// String returns a string representation of all managed addresses.
+func (ma *MetaAddr) String() string {
+	if len(ma.addresses) == 0 {
+		return "meta(empty)"
+	}
+
+	result := "meta("
+	for i, addr := range ma.addresses {
+		if i > 0 {
+			result += ", "
+		}
+		result += addr.String()
+	}
+	result += ")"
+
+	return result
+}