The Eagles continued the trend of bringing back their own free agents with Thursday’s announcement that they signed defensive end Derek Barnett to a two-year contract. Barnett’s return was a bit of a surprise after the Eagles inked edge rusher Haason Reddick to a three-year, $45 million deal last week. But he wasn’t garnering much interest in free agency and the Eagles decided to roll it back with their 2017 first-round draft pick, and likely at a lower per-year salary than he earned in 2021. Barnett wasn’t a first-round bust, but he failed to deliver upon the draft capital and a promising roo…