distro11s-kernel: newer udev packages need DEVTMPFS

Without CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT, udev will fail to
start, causing boot issues with distrolls.  Fix this by adding these
configs to our defconfig.

Signed-off-by: Jason Abele <jason@cozybit.com>
distro11s-qemu: add host keys to known_hosts

During qemu cleanups, it is nice to add/update the host keys in users
known_hosts file.

Signed-off-by: Jason Abele <jason@cozybit.com>