Macro suspendable_virtio_tests

macro_rules! suspendable_virtio_tests {
    ($name:ident, $dev: expr, $num_queues:literal, $modfun:expr) => { ... };
}

name is the name of the test grouping. Can be anything unique within the same crate. dev is a block that returns a created virtio device. ``num_queuesis the number of queues to be created.modfun` is the function name of the function that would modify the device. The function call should modify the device so that a snapshot taken after the function call would be different from a snapshot taken before the function call.