Fixed test suite on Oracle that was broken by using keyword "date" as a field...

Fixed test suite on Oracle that was broken by using keyword "date" as a field name.  Refs #4140 and #10422.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@10689 bcc190cf-cafb-0310-a4f2-bffc1f526a37