By Libby George LAGOS, Dec 8 (Reuters) – Nigeria’s health minister said on Wednesday some COVID-19 doses donated by rich Western countries had a shelf life that left only weeks to administer the shots. Osagie Ehanire said the health ministry had declined a request by some vaccine manufacturers to extend the shelf life of the doses by three months. Two sources have told Reuters that up to one million COVID-19 vaccines are estimated to have expired in Nigeria last month…