update gobgp pkg

vendor/github.com/vishvananda/netlink/netlink.go

@@ -27,7 +27,8 @@ func ParseIPNet(s string) (*net.IPNet, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &net.IPNet{IP: ip, Mask: ipNet.Mask}, nil
+	ipNet.IP = ip
+	return ipNet, nil
 }
 
 // NewIPNet generates an IPNet from an ip address using a netmask of 32 or 128.