JOHANNESBURG (Reuters) - Zimbabwe President Robert Mugabe, his wife Grace and two key figures from her G40 political faction are under house arrest at Mugabe s  Blue House  compound in Harare and are insisting the 93-year-old finishes his presidential term, a source said. The G40 figures are cabinet ministers Jonathan Moyo and Saviour Kasukuwere, who fled to the compound after their homes were attacked by troops in Tuesday night s coup, the source, who said he had spoken to people inside the compound, said. 