Workarounds for making the bootup safer on low mem systems

On low mem systems. E.g. our Alix board with 256 MB RAM the bootup crashes often because random processes get killed (out_of_swap_space). In some cases even the routing or the firewall does not start.
So with this packaged the admin can delays the bootup. Often the software seems to grab a lot of RAM and then release it again. So if we start several OpenVPN servers at once it crashes but if we start them one by one and wait in between it works.