To get booted off the street, a police officer has to do something pretty serious - like shoot a suspect or be accused of brutality. But in the 35th District, which covers Logan, Olney and adjacent neighborhoods, apparently a hairdo will do it. A cop who got cornrows was ordered off the street and kept on desk duty for two days until he cut his braids off, sources said. While dozens of black officers across the city wear cornrows, Officer Thomas Strain is white. So when the five-year veteran showed up for work Sept. 3 with the traditionally black hairstyle,...