fai dirinstall does not check for errors in task instsoft

[Michael Prokop]

Hi,

when using FAI's dirinstall the task "instsoft" does not seem to be
checked for any errors. The attached patch works at least for me
(though you might want to improve the "die"-message :)). Maybe we
want to implement some additional checks as well?

I also noticed that 'fai dirinstall' seems to always return with
exitcode 0. I think we should do something here. :)

Please let me know if you need some testing, I know some "special"
packages which are known to fail installation. You can reach me on
IRC as well.

regards,
-mika-
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