In the old procs used on appveyor, the temp table data was leaking ac…

…ross aborts because a mysql abort doesn't fully abort.

src/relstorage/tests/__init__.py

@@ -290,6 +290,8 @@ def rollback_quietly(self, conn, cursor): # pylint:disable=unused-argument
         if hasattr(conn, 'rollback'):
             conn.rollback()
 
+    rollback_store_quietly = rollback_quietly
+
     def rollback_and_close(self, conn, cursor):
         self.rollback_quietly(conn, cursor)
         if conn: