oss ydb: fix dstool building and test run

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+Metadata-Version: 2.1
+Name: futures
+Version: 3.4.0
+Summary: Backport of the concurrent.futures package from Python 3
+Home-page: https://github.com/agronholm/pythonfutures
+Author: Brian Quinlan
+Author-email: brian@sweetapp.com
+Maintainer: Alex Grönholm
+Maintainer-email: alex.gronholm@nextday.fi
+License: PSF
+Platform: UNKNOWN
+Classifier: License :: OSI Approved :: Python Software Foundation License
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Intended Audience :: Developers
+Classifier: Programming Language :: Python :: 2.6
+Classifier: Programming Language :: Python :: 2.7
+Classifier: Programming Language :: Python :: 2 :: Only
+Requires-Python: >=2.6, <3
+
+.. image:: https://travis-ci.org/agronholm/pythonfutures.svg?branch=master
+  :target: https://travis-ci.org/agronholm/pythonfutures
+  :alt: Build Status
+
+This is a backport of the `concurrent.futures`_ standard library module to Python 2.
+
+It **does not** work on Python 3 due to Python 2 syntax being used in the codebase.
+Python 3 users should not attempt to install it, since the package is already included in the
+standard library.
+
+To conditionally require this library only on Python 2, you can do this in your ``setup.py``:
+
+.. code-block:: python
+
+    setup(
+        ...
+        extras_require={
+            ':python_version == "2.7"': ['futures']
+        }
+    )
+
+Or, using the newer syntax:
+
+.. code-block:: python
+
+    setup(
+        ...
+        install_requires={
+            'futures; python_version == "2.7"'
+        }
+    )
+
+.. warning:: The ``ProcessPoolExecutor`` class has known (unfixable) problems on Python 2 and
+   should not be relied on for mission critical work. Please see `Issue 29 <https://github.com/agronholm/pythonfutures/issues/29>`_ and `upstream bug report <https://bugs.python.org/issue9205>`_ for more details.
+
+.. _concurrent.futures: https://docs.python.org/library/concurrent.futures.html
+
+