CHESAPEAKE — It had seemed that the last two Kmarts in Virginia might be invincible. The locations at 2001 S. Military Hwy. in Chesapeake and 5007 Victory Blvd. in Tabb, York County, survived years of the drip-drip-drip, one-by-one store closures elsewhere in Hampton Roads. The stores even emerged from their parent company’s bankruptcy proceedings this year with the doors still open.