SAN FRANCISCO, Feb 4 (Reuters) - Chrysler Group LLC is working to refinance what its chief executive characterized as "shyster loans" that the Obama administration extended as part of a bailout to keep the automaker from collapse in 2009. "I want to pay back the shyster loans," Sergio Marchionne said at an industry conference, using a derogatory term for an unethical lawyer or politician. "Pay back the loans, get those out and then take (the company) public." Marchionne, who is also CEO of Italy's Fiat SpA (FIA.MI), has said repeatedly that the high interest rates on loans Chrysler owes the...