By Jonathan Stempel SAN FRANCISCO/NEW YORK (Reuters) – A former Twitter Inc manager accused of spying for Saudi Arabia was convicted on Tuesday on six criminal counts, including acting as an agent for the country and trying to disguise a payment from an official tied to Saudi’s royal family. Ahmad Abouammo, a dual U.S.-Lebanese citizen who at Twitter helped oversee relationships with journalists and celebrities in the Middle East and North Africa, was found guilty after a 2-1/2 week trial in San Francisco federal court. Jurors acquitted him on five of the 11 counts he faced. Federal public def…