Tests: reworked python tests with application.

test/python/atexit/wsgi.py

@@ -0,0 +1,12 @@
+import atexit
+
+def application(environ, start_response):
+    test_dir = environ.get('HTTP_TEST_DIR')
+
+    def create_file():
+        open(test_dir + '/atexit', 'w')
+
+    atexit.register(create_file)
+
+    start_response('200', [('Content-Length', '0')])
+    return []