The Henrico County Public Schools district is facing its largest school bus driver shortage in more than a decade.  After schools shut down last March, many part-time drivers, who are not under contract, left their school district jobs.  “We certainly did our best to give them an opportunity to work so that they can still get a check, but many of them had to find something else,” said Jim Ellis, HCPS transportation director. “So we lost a lot of our support staff.” Last April, the district instated a hiring freeze, and it was difficult to bring anyone on board during...