Slight refactoring of isolation setting from r10029.
Slight refactoring of isolation setting from r10029.

There was a bug in the way we were reading the DATABASE_OPTIONS setting
and a lot of essentially duplicated code. This is neater.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10033 bcc190cf-cafb-0310-a4f2-bffc1f526a37

--HG--
extra : convert_revision : 07c472778e0e5d4eff08eb4c181a3e07dce9fbfd

adieu/django-nonrel,heracek/django-nonrel,heracek/django-nonrel,adieu/django-nonrel,adieu/django-nonrel,heracek/django-nonrel