test: close_on_teardown=False

Get from second connection may be executed before Set on first
connection. This cause test failure.

Author: methane

test_flask_pymemcache.py

@@ -15,7 +15,7 @@ def test_simple(self):
         app.config['PYMEMCACHE'] = {
             'server': ('localhost', 11211),
             'key_prefix': b'px',
-            'close_on_teardown': True}
+            'close_on_teardown': False}
         memcache.init_app(app)
 
         with app.app_context():