By Matt Hladik The Pittsburgh Steelers are making the expected move to replace defensive coordinator Keith Butler, promoting senior defensive assistant/secondary coach Teryl Austin to the role. Austin has been with the franchise since 2019, and has been regarded as the DC-in-waiting. He interviewed with the New York Giants for their defensive coordinator vacancy this weekend, but reports today indicate the Steelers are on the verge of finalizing a contract with Austin. The 56-year-old Austin, a Pennsylvania native, has extensive experience as an NFL and college assistant. He was the defensive …