Fix failing api tests for 4.1

From Eileen:
I do need some help to get API test to 100% - there are only 4 failing but I can't get them fixed and I would hate to go stable without getting them to 100%.
I did put something about the problems in another email. The contact ones I can't replicate but relates to data - contribution_type table presumably being trashed by a test in v2 suite or earlier in the run, The participant one isn't API and the pledge one I'm absolutely stuck on.

– comments from lobo on this —
Sometimes when we can verify a test runs independently, we are fine with it failing during a sequence if we've spent too long trying to figure out whats failing and why
Seems like for at least one of them we know why (contribution_type) and that should be an easier fix
But i think the web/api v2/api v3/CRM tests are all run independent, i.e. we start from a clean DB for each of them