Henry Kravis, dealmaker extraordinaire, was this week strolling the corridors of Wall Street. But when the co-founder of Kohlberg Kravis Roberts and Scott Nuttall, one of his young partners, visited staff at Morgan Stanley and Goldman Sachs on Monday, it was not because he was about to acquire and restructure yet another troubled industrial company, taking it off the stock market. Instead, the two investment banks are advising KKR on what is to be its own New York listing.