* Kone shares drop 7%, Thyssenkrupp down 3.7% (Adds comments from sources, Kone CEO, analyst): FRANKFURT/DUESSELDORF, Germany (Reuters) - Germany’s Thyssenkrupp (TKAG.DE) has shortlisted two private equity consortia in the sale of its 16 billion euro ($17 billion) elevator unit, dealing a blow to Finland’s Kone (KNEBV.HE), which withdrew from the closely watched deal. Potentially Europe’s biggest private-equity deal in 13 years, the transaction is now in its last stages and could come to a head next week when Thyssenkrupp’s supervisory board is scheduled to meet.