CRM-12378 a new webtest helper function introduction which can help dete...

added a helper function 'customFieldSetLoadOnTheFlyCheck', which will do a check for custom field rendering which happen 'on the fly' i.e. through ajax callback.

So, now if a entity supports such a 'on the fly' rendering, you can use this function by passing necessary arguments to it in the entity specific test.

in this commit, done entity specific handling which supports such on the fly custom field rendering.