OSLO (Reuters) -NATO Secretary General Jens Stoltenberg will become Norway’s new central bank chief, the government said on Friday, despite opposition worries that the appointment of the former prime minister could weaken Norges Bank’s independence. While the job is open from March 1, Stoltenberg has said he would first serve out his term at NATO, which runs until Sept. 30. Norges Bank separately said it expects the new governor to take over on or around Dec. 1 this year. Stoltenberg will be in charge of setting interest rates and manage financial stability as well as overseeing Norway’s sover…