OSLO (Reuters) - Offshore drilling firm Seadrill said on Thursday the recent recovery of rig markets had slowed at the start of 2020, and that discussions with creditors on how to handle its massive debts would continue.The company booked $39 million in adjusted earnings before interest, tax, depreciation and amortisation (EBITDA) for the fourth quarter, in line with its own guidance of $40 million (31 million pounds) made late last year."We have seen a broad-based market recovery through 2019..