python3-pbr: change shebang to python3

we have offcially dropped python2, so it is possible
that our code run on python3 only host, so change
shebang to python3 to avoid error like:
python: command not found

(From OE-Core rev: a0b6ae56970aa53f65ed10bebd90fefa410a7099)

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3-pbr/0001-change-shebang-to-python3.patch

@@ -0,0 +1,42 @@
+From 09bd8368bf0d5385663a10eeb890131481681bdd Mon Sep 17 00:00:00 2001
+From: Changqing Li <changqing.li@windriver.com>
+Date: Thu, 23 Apr 2020 09:28:58 +0000
+Subject: [PATCH] change shebang to python3
+
+Upstream-Status: Pending
+
+Signed-off-by: Changqing Li <changqing.li@windriver.com>
+---
+ pbr/tests/test_integration.py | 2 +-
+ pbr/tests/test_packaging.py   | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/pbr/tests/test_integration.py b/pbr/tests/test_integration.py
+index 8e96f21..b07cbe3 100644
+--- a/pbr/tests/test_integration.py
++++ b/pbr/tests/test_integration.py
+@@ -150,7 +150,7 @@ class TestInstallWithoutPbr(base.BaseTestCase):
+         pkgs = {
+             'pkgTest': {
+                 'setup.py': textwrap.dedent("""\
+-                    #!/usr/bin/env python
++                    #!/usr/bin/env python3
+                     import setuptools
+                     setuptools.setup(
+                         name = 'pkgTest',
+diff --git a/pbr/tests/test_packaging.py b/pbr/tests/test_packaging.py
+index 07be547..f6a9412 100644
+--- a/pbr/tests/test_packaging.py
++++ b/pbr/tests/test_packaging.py
+@@ -206,7 +206,7 @@ class CreatePackages(fixtures.Fixture):
+ 
+     defaults = {
+         'setup.py': textwrap.dedent(six.u("""\
+-            #!/usr/bin/env python
++            #!/usr/bin/env python3
+             import setuptools
+             setuptools.setup(
+                 setup_requires=['pbr'],
+-- 
+2.24.1
+