initscript emulation layer fails on start/stop/restart for jobs that don't spawn long lived processes

/lib/init/upstart-job doesn't perform the requested stop/start/restart action for Upstart jobs that don't spawn long-lived processes.

For example, qemu-kvm's upstart job doesn't start any daemons, but rather its pre-start script sets some sysctls and loads kernel modules, and its post-stop script removes those modules. Its job scripts never get called when the init script emulation (/etc/init.d, invoke-rc.d(8)) is used, since no process is associated with the job.

This seems to be the case even in the most recent upstart, in natty (0.6.6-3).

start|stop|restart)
[...]
    PID=$(status "$JOB" 2>/dev/null | awk '/[0-9]$/ { print $NF }')
    if [ -z "$PID" ] && [ "$COMMAND" = "stop" ]; then
        exit 0
    elif [ -n "$PID" ] && [ "$COMMAND" = "start" ]; then
        exit 0
    elif [ -z "$PID" ] && [ "$COMMAND" = "restart" ]; then
        start "$JOB"
        exit 0
    fi