Fix tests so that they can work with `NSPrivateQueueConcurrencyType`
Fix tests so that they can work with `NSPrivateQueueConcurrencyType`

davidmdavis/contentful.objc,davidmdavis/contentful.objc,contentful/contentful.objc,davidmdavis/contentful.objc,contentful/contentful.objc,contentful/contentful.objc