* Ex-soldier faces life in prison for role in genocide
* Defendant called "torturer", but he alleges witch-hunt
* Prosecutors seek life term in prison, verdict Friday
By Chine Labbe
PARIS, March 13 (Reuters) - French prosecutors are seeking a life term for a Rwandan ex-soldier accused of participating in the country's 1994 genocide, in a verdict due on Friday that could decide whether ...