The user-data script sets the options in /etc/dhcp3/dhclient.conf. 
The supersede and prepend tags make sure that when the lease is renewed, those 
options supersede and prepend the ones retrieved via dhcp. So those options 
should always override, at least, that's how I understand it, and also, as part 
of the script, I do a 

/etc/init.d/networking restart

for good measure which runs dhclient. So if the options were going to be
overwritten, they would be immediately.

As for changing net/vnetwork.c in the way you suggested, do you mean
that as a fix I should do, then submit, or just for me specifically? I
was looking at doing it in a way that's configurable that could be used
by others.

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https://bugs.launchpad.net/bugs/680301

Title:
  DNS Search Domain in instance /etc/resov.conf should be set by DHCP

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