By Scott Murdoch and Valentina Za SYDNEY/MILAN (Reuters) -Italian luxury yacht maker Ferretti Group is expected to kick off on Monday the process to list its shares in Hong Kong, aiming for a valuation of around $1 billion as it sells a 25% stake, two sources close to the matter said. Ferretti, controlled by Chinese conglomerate Weichai Group, is pushing ahead with its initial public offering (IPO) despite the conflict in Ukraine rattling financial markets and hitting shares in the superyacht sector. The pre-marketing phase ends on Friday and the company, which ditched a previous IPO attempt i…