Command line runner for Sedna

This serves as a simple command line runner for a Sedna VM and a small reference on how to set up and run a VM from code.

The VirtIO file system providing access to the host filesystem is mounted automatically during boot and an init script mounts things under /mnt. Once logged in (as root), the host directory is at /mnt/host_fs, with /mnt/host_fs/bin already on PATH.

ls /mnt/host_fs

To terminate a session gracefully, in the guest run

poweroff