Merge ~pappacena/turnip/+git/turnip-dependencies:concurrent-futures into ~canonical-launchpad-branches/turnip/+git/dependencies:master

[Thiago F. Pappacena]

Adding backport for python2 of concurrent.futures (https://docs.python.org/3/library/concurrent.futures.html).

Unmerged commits

4b33429... by Thiago F. Pappacena on 2020-05-27

Adding concurrent.futures backport for python2

1223e31... by Thiago F. Pappacena on 2020-05-26

Adding mock package

diff --git a/funcsigs-1.0.2.tar.gz b/funcsigs-1.0.2.tar.gz
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diff --git a/six-1.15.0.tar.gz b/six-1.15.0.tar.gz
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