(Recasts paragraph 1, adds context and shareholder payout in paragraphs 2-5) By Fabio Teixeira and Marta Nogueira RIO DE JANEIRO, May 13 (Reuters) – Brazilian state-run oil firm Petrobras posted a 38% fall in its first-quarter net recurring profit from a year earlier on Monday, missing analysts’ expectations on the result and its dividend, hit […]