fix: Make sure there are no leases left behind from when oz was building the image (causing the final image to fail in getting an address).
fix: Disable hardware machine check on FreeBSD since that fails on AMD cpu's, causing them to halt with an interrupt 9-like error.
new: Log all boot messages to the serial console so they can be captured at the hypervisor.

While sed -I should take care of in-place editting, it apparently
doesn't which is why we explicitly remove the .bak file. Else it just
complains about the regex: \1 not defined in the RE.
change: Use the 10.0-RELEASE repository.
fix: Make sure there is only 1 partition so that it's easier to resize (specifically: grow) it once an instance is booted with it.