Wrong test-case in InlineFormSetViewTests, GenericInlineFormSetViewTests and ModelWithInlinesTests with postgresql-db

[kampfschlaefer]

We are using a postgresql-db which has transactions.

When we run your tests against sqlite3 the above testcases work, when running against postgresql, they fail.
When we use TransactionTestCase instead of TestCase as base-class, the tests work like expected.

[AndrewIngram]

I've switched the tests to use TransactionTestCase