Merge pull request #2616 from arkodg/use-host-ip-for-version

Use hostIP to decide on Portmapper version

libnetwork/drivers/bridge/port_mapping.go

@@ -139,7 +139,7 @@ func (n *bridgeNetwork) allocatePort(bnd *types.PortBinding, ulPxyEnabled bool)
 
 	portmapper := n.portMapper
 
-	if bnd.IP.To4() == nil {
+	if bnd.HostIP.To4() == nil {
 		portmapper = n.portMapperV6
 	}