Fixed #17251 -- In the select_for_update tests, close manually database...

Fixed #17251 -- In the select_for_update tests, close manually database connections made in threads, so they don't stay "idle in transaction" until the GC deletes them. Thanks Anssi Kääriäinen for the report and patch.



git-svn-id: http://code.djangoproject.com/svn/django/trunk@17195 bcc190cf-cafb-0310-a4f2-bffc1f526a37