Every first Thursday of the month is DMV Day in Gilliam County. It’s the only day each month that, for five hours, the fewer than 2,000 residents of this east-central Oregon county can line up to take a driving test, renew a driver’s license, or, like Tim McDonald of Rock Creek, retitle a trailer.The Condon DMV has no full-time staff, but on a recent foggy Thursday morning, the small waiting room was packed with people who otherwise would have t…