WASHINGTON — The Obama administration is encouraging many non-violent federal prisoners to apply for early release — and expecting thousands to take up the offer. It’s an effort to deal with high costs and overcrowding in prisons and also a matter of fairness, the government said. On Wednesday, the Justice Department unveiled a revamped clemency process directed at low-level felons imprisoned for at least 10 years who have clean records while in custody. The effort is part of a broader …