UPDATE 2-Hess Corp to sell Russian unit to Lukoil for $2.05 bln

* Hess shares up 2.7 percent * Hess proceeds $1.8 bln * Lukoil shares down 1.2 pct By Michael Erman and Vladimir Soldatkin NEW YORK/MOSCOW, April 1 (Reuters) - Hess Corp, which has been besieged by activist investors pushing for change at the oil and gas company, said it would sell its Russian unit to Lukoil for $2.05 billion as it works to reshape its sprawling energy business. Lukoil, Russia's second-largest crude oil producer, is buying the unit - called Samara-Nafta - a