Comment 8 for bug 1307475

I don't see any problem with removed tenant, we'll return not found for it, there is question how to clean up db after that, but I think it isn't problem. Otherwise, as for me, it is confusing behavior if we don't check tenant on show operation and return default value, it is possible that I make mistake in tenant id , and will get wrong quotas, I prefer to get not found error instead.