(Reuters) -Renault is to sell its majority stake in carmaker Avtovaz to a Russian science institute reportedly for just one rouble with a six-year option to buy it back, leaving the door open for the French carmaker’s return. Moscow Mayor Sergei Sobyanin said that in order to preserve thousands of jobs, Renault’s plant in the city would be used to restart production of the Soviet-era Moskvich brand. Renault, the Western carmaker most exposed to the Russian market, said on Monday that its holding of nearly 67.69% in Avtovaz would be sold to the Russian Central Research and Development Automobil…