fix python3-pbr install fail problem without python2

python-pbr.spec

@@ -1,6 +1,6 @@
 Name:           python-pbr
 Version:        5.4.5
-Release:        2
+Release:        3
 Summary:        Python Build Reasonableness
 License:        ASL 2.0
 URL:            http://pypi.python.org/pypi/pbr
@@ -52,11 +52,11 @@ export SKIP_PIP_INSTALL=1
 %py3_build
 
 %install
+%py2_install
 %py3_install
 rm -rf %{buildroot}%{python3_sitelib}/pbr/tests
 mv %{buildroot}%{_bindir}/pbr %{buildroot}%{_bindir}/pbr-3
 ln -s ./pbr-3 %{buildroot}%{_bindir}/pbr
-%py2_install
 
 %check
 %{__python3} setup.py test
@@ -79,6 +79,9 @@ ln -s ./pbr-3 %{buildroot}%{_bindir}/pbr
 
 
 %changelog
+* Wed Aug 04 2021 shixuantong <shixuantong@huawei.com> - 5.4.5-3
+- fix python3-pbr install fail problem without python2
+
 * Wed 16 Jun 2021 sunguoshuai<sunguoshuai@huawei.com> - 5.4.5-2
 - Add some buildrequires packages for testing and skip some testcases.