Bug#799361: DHCP preseed test already present in auto-install.sh

[Philip Hands <phil@hands.com>]

Control: tags -1 + pending

Hi,

looking further, I now see that there's a test for DHCP preseeds
in auto-install.sh (which runs after the network comes up).

That being the case, the only issue is the logic inversion of the if
statement, so I just pushed a fix to that (51ecf03)

Cheers, Phil.
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