* Donatella Versace called staff meeting for Tuesday -source (Adds Michael Kors shares, analyst, Versace holding ownership): LONDON (Reuters) - U.S. fashion group Michael Kors (KORS.N) has agreed to take control of Versace in a deal that could value one of Italy’s most prized designers at $2 billion, sources familiar with the matter said on Monday. Budding luxury conglomerates, including Michael Kors’ U.S. rival Tapestry (TPR.N), owner of Coach and Kate Spade, are trying to make in-roads into an industry still dominated by European players such as Louis Vuitton owner LVMH (LVMH.PA).