Pick off a couple of easy ports

src/allmydata/_auto_deps.py

@@ -1,3 +1,16 @@
+"""
+Ported to Python 3.
+"""
+
+from __future__ import unicode_literals
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
+
 # Note: please minimize imports in this file. In particular, do not import
 # any module from Tahoe-LAFS or its dependencies, and do not import any
 # modules at all at global level. That includes setuptools and pkg_resources.