Most musicians have day jobs. Now two musicians own theirs. Cooks Mick "The Deli Lama" Stevenson and Dennis "DJ" Rogers have kept the original Dad's Sandwich Shop going strong at 1310 S St. after assuming ownership three months ago. Dad's Kitchen at 2968 Freeport Blvd. near Curtis Park closed after its owners, Alison and Sam "Dad" England, weren't able to find a buyer. Diners may not even know a change of ownership took place, because Rogers and Stevenson had largely been running the restaurant, which operates from 8 a.m. to 4 p.m. Monday through Friday, they said. Rogers, 26, also plays guitar in the hardcore punk band Killing The Dream, and 37-year-old Stevenson is in three bands: a pu