duplicity 0.8.00 doesn't work with python 2.7

[az]

...as the code insists in two places on python 3.

--- a/bin/duplicity
+++ b/bin/duplicity
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python
 # -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*-
 #
 # duplicity -- Encrypted bandwidth efficient backup
--- a/testing/find_unadorned_strings.py
+++ b/testing/find_unadorned_strings.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python
 # -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*-
 #
 # Copyright 2018 Aaron Whitehouse <email address hidden>
--- a/testing/fix_unadorned_strings.py
+++ b/testing/fix_unadorned_strings.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python
 # -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*-
 #
 # Copyright 2018 Aaron Whitehouse <email address hidden>

[Sebastien Bacher (seb128)]

Those changes create issue when building with python3 on an env where python is python2 it looks like...

$ cd /tmp
$ bzr branch lp:duplicity
$ cd duplicity
$ bzr revno
1389
$ python3.7 setup.py build --force
$ PYTHONPATH=/tmp/duplicity/build/lib.linux-i686-3.7/ python3.7 ./setup.py test
(that's on an i386 chroot, path to adapt for amd64)

ends up with that error

b' File "/build/duplicity/duplicity/librsync.py", line 33, in <module>'
b' from . import _librsync'
b'ImportError: cannot import name _librsync'

which is because bin/duplicity uses python2 but the .so is built for python3 only in that scenario