core/bean iterator is broken

The bean iterator implementation is returning the wrong data. One place the iterator is used is with transduce, which is under into:

Cause: The iterator impl in bean is incorrectly implemented and exposing some of the inner details instead.

Approach: Pull an iterator from the seq impl. The seq impl uses an embedded fn - the patch pulls that up and invokes from both seq and iterator.

Patch: clj-1841.patch