By Karolos Grohmann ANCIENT OLYMPIA, Greece (Reuters) – Human rights activists unfurled a banner reading “No Genocide Games”, waved a Tibetan flag and called for a boycott of the Beijing 2022 Winter Olympics during the torch-lighting ceremony on Monday. Two women and a man sneaked past a tight police cordon and entered the archaeological site of the ancient Greek stadium and temple where the Olympic flame is traditionally lit and which had been sealed off for days. They held up a Tibetan flag seconds after the torch was lit by an actress playing the role of high priestess at the Temple of Hera…