add a simple test which runs md5 on a virtio disk
add a simple test which runs md5 on a virtio disk

rumpkernel-attic/rumprun-baremetal,rumpkernel-attic/rumprun-baremetal,ujamjar/rumpuser-baremetal,ujamjar/rumpuser-baremetal,rumpkernel-attic/rumprun-baremetal,ujamjar/rumpuser-baremetal