Fixed #10831 -- Prevented code running under a to-be-rolled-back test from...

Fixed #10831 -- Prevented code running under a to-be-rolled-back test from calling commit via transaction.managed(False).  Thanks seanl for report and patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@10621 bcc190cf-cafb-0310-a4f2-bffc1f526a37