NUR-SULTAN( Reuters)-Two members of former Kazakh president Nursultan Nazarbayev's extended family have resigned from the leadership of state oil and gas shipping companies, the Central Asian nation's sovereign fund said on Saturday. Nazarbayev, Kazakhstan's leader for three decades before his resignation in 2019, retained sweeping powers until last week, when his successor Kassym-Jomart Tokayev took over from Nazarbayev as security council chairman amid violent unrest. The 81-year-old former le