fyi.opensocial.checkImport

What moving an account here would make of it, before anything moves (importAccount moves it so): its handle here, whether that's the one it has, and its address, this host's own name for it. A handle on a domain of the account's own that still names it comes along; one its old server gives out becomes the address. `refused` says why it can't have that address, as importAccount would. While the caller's own move of it is pending, `recommendedCreds` says again what the operation should name, as importAccount did.