[PATCH runin] Port to systemd

[James Cameron]

Thanks for the patch, I reviewed it and took it into my repo for
testing.  I already knew olpc-configure was to run first.

A trivial issue that I'll test and fix myself: the init.d script sets
environment variables and exports them for the called runin-main script
to use, and I suspect the runin-check systemctl invocation does not
transmit the environment.  I plan to move most of this to runin-main.

-- 
James Cameron
http://quozl.linux.org.au/