blkio/drivers/virtio_blk: fail "fd" setting earlier as possible

Currently only virtio-blk-vhost-vdpa driver supports the "fd" property. If users set "fd" for other drivers, they will receive an error only during blkio_connect().

Let's allow the user to check if "fd" is supported or not by the driver earlier as possible, when "fd" is set.

Signed-off-by: Stefano Garzarella sgarzare@redhat.com

mentioned in commit c6a81c8d

merged

mentioned in commit stefanha/qemu@1c38fe69

mentioned in commit sgarzarella/qemu-kvm-c-9-s@d57aafb2

mentioned in merge request redhat/centos-stream/src/qemu-kvm!194 (closed)

mentioned in commit redhat/centos-stream/src/qemu-kvm@05f5a70c