* IMF has told Ukraine it should end subsidies for home gas * Ex-Soviet republic negotiating $15 bln loan from IMF * Yanukovich makes slew of promises to shore up public image By Richard Balmforth KIEV, Feb 22 (Reuters) - Ukrainian President Viktor Yanukovich pledged on Friday to keep down the price of gas in the home, using a four-hour, televised question-and-answer session to counter an image of being out of touch with his people.