It’s getting late in the off-season. By one estimate, there are only 18 open roster spots round the league not counting two-way contracts or training camp invites. The Nets, hamstrung by Kevin Durant’s trade request (or if you like, demand) and uncertainty surrounding Kyrie Irving, still have a lot of decisions to make before camp opens the last week of September. They currently have only 12 players on guaranteed NBA deals — including KD and Kyrie — as well as a partially guaranteed deal (Edmond Sumner) and a two-way deal (Alondes Williams). That gives them two open roster spots and…