Stray Cats – Live at Rockpalast (DVD/2CD) 145 mins., $24.99 Today, the Stray Cats are best remembered as the flagship band of the ‘80s rockabilly renaissance, their retro riffs and pompadoured quiffs perfect for the then-fledgling MTV in videos like “Rock This Town,” “Stray Cat Strut” and “She’s Sexy + 17.” And…