Added some directories on Jenkins to flake8 exclude.

setup.cfg

@@ -3,7 +3,7 @@ doc_files = docs extras AUTHORS INSTALL LICENSE README.rst
 install-script = scripts/rpm-install.sh
 
 [flake8]
-exclude=build,.git,./django/utils/dictconfig.py,./django/utils/unittest.py,./django/utils/lru_cache.py,./django/utils/six.py,./django/conf/app_template/*,./django/dispatch/weakref_backports.py
+exclude=build,.git,./django/utils/dictconfig.py,./django/utils/unittest.py,./django/utils/lru_cache.py,./django/utils/six.py,./django/conf/app_template/*,./django/dispatch/weakref_backports.py,./tests/.env,./xmlrunner,./tests/test_*.py
 ignore=E123,E128,E265,E501,W601
 max-line-length = 119