OSLO (Reuters) – Norwegian oil firms and employees have agreed in principle a new wage deal, avoiding for now a strike at nine fields that could have hit the country’s petroleum output, employers and unions said on Sunday. Two of the three unions that negotiated with oil firms will seek approval from their members before they formally approve the deal, the lobby representing employers and two union leaders told Reuters. “Agreement. No strike. But Lederne and Safe (trade unions) send the results to a referendum (of) their members,” a spokesman for the Norwegian oil and gas lobby said. “They wil…