Use-case example.

This example shows how bus can be used in a init
system to provide "aggressivly" parallel startup
of daemons.


First of, run make to build this example.

To start the example run ./init. It will print in
red export-statement you may want to run i other
terminals. You will need to select at least one
daemon, for example you can run `./init d-ntp`.
The available pretend daemons are: d-network,
d-ntp and d-ssh.

When you are done run ./cleanup with BUS_INIT
exported with the value printed by ./init.