2.7: Switch to importpatches

[encukou]

I've edited a few commit messages to make work with importpatches.
And then backported a CVE.
Dist-git PR: https://src.fedoraproject.org/rpms/python2.7/pull-request/4

[stratakis]

The last commit won't work with Python 2 (cve-2020-26116 fix). Better to backport the commit from the 3.5 branch which should be fine (haven't tested it yet myself). python#21946

[encukou]

Ah, that might be right. Limiting the scope to just the switch to importpatches.

[hroncok]

At this point, I don't really understand this as a PR (it is not mergeable anyway). The list of commits looks OK, I'll review it trough the src.fp.o PR. Where I can see the changes more easily.

[encukou]

It should be force-pushed to fedora-2.7, rather than rebased/squashed/merge-committed.
Review however best works for you; the branch is available here if you need it :)

[encukou]

Punched and tagged.

[hroncok]

[vstinner]

Oh nice, a 2.7 branch. Thanks @encukou!