Comment 1 for bug 1335697

update-guestfs-appliance was supposed to be run from postinst script of libguestfs0 deb package:

case "$1" in
    configure|reconfigure)
        . /usr/share/debconf/confmodule
        db_get libguestfs/update-appliance
        if [ "$RET" = true ]; then
            update-guestfs-appliance >&2 || true
        fi
    ;;

The libguestfs/update-appliance is set to true by puppet here:
https://github.com/stackforge/fuel-library/blob/master/deployment/puppet/nova/files/guestfs.seed
https://github.com/stackforge/fuel-library/blob/master/deployment/puppet/nova/manifests/utilities.pp