CRM-20016 preliminary work - add basis for unit testing and failing unit test.

CRM-20016 preliminary work - add basis for unit testing and failing unit test.

In writing the test I identified the transation was not rolling back due
to the api not following our crud format. I fixed it to 'fail' because
we should not be passing despite mysql errors & ... we should fix the errors...

The BAO code in fact holds transaction handling to ensure that a fail causes a fail - but
we were bypassing it without passing in the 'is_transactional' param.