some system activation fixes

[Havoc Pennington]

I think it's probably trivial to remove the rest of the "if 
(!use_launcher)" from dispatch.c with these fixes, my guess is most of 
the tests will pass if a few more error codes are added as needed.

If the tests are run with DBUS_VERBOSE=1 then I made the helper just 
print out the original error when it doesn't have an exit code already, 
so when dispatch.c tests fail due to getting unexpected SetupFailed just 
add an exit status so the expected error can be propagated from the 
helper up to the daemon.

Havoc

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