It can happen to the most committed of city folk. The moment they have kids, they start scanning Zillow for a house in the suburbs. They trade in their Canton rowhome for a farmhouse in Hereford, or a rambler in Woodstock. Once they get there, they encounter another harsh reality of suburban life: there’s no place to eat. Or at least there wasn’t. Rosie’s Delicatessen, a New York-style Italian deli in Glenwood, opened its doors in January, serving up excellent sandwiches to western Howard County.