xtreemfs: switch to python3

pkgs/tools/filesystems/xtreemfs/default.nix

@@ -1,5 +1,20 @@
-{ stdenv, boost, fuse, openssl, cmake, attr, jdk, ant, which, file, python2
-, lib, valgrind, makeWrapper, fetchFromGitHub, fetchpatch }:
+{ stdenv
+, lib
+, fetchFromGitHub
+, fetchpatch
+, makeWrapper
+, ant
+, attr
+, boost
+, cmake
+, file
+, fuse
+, jdk
+, openssl
+, python3
+, valgrind
+, which
+}:
 
 stdenv.mkDerivation {
   src = fetchFromGitHub {
@@ -13,8 +28,8 @@ stdenv.mkDerivation {
   pname = "XtreemFS";
   version = "1.5.1.81";
 
-  nativeBuildInputs = [ makeWrapper ];
-  buildInputs = [ which attr python2 ];
+  nativeBuildInputs = [ makeWrapper python3 ];
+  buildInputs = [ which attr ];
 
   patches = [
     (fetchpatch {