Add a VGAONLY attribute to the post-frisbee customization.
This is for BSD, so that we can tweak the default /boot/loader.conf file to turn off "comconsole" on machines that don't have a UART. In my experience, trying to probe the UART on newer machines that don't have one causes a kernel crash. Currently this attribute is just signalled by the existance of the /etc/testbed/isvgaonly file in the diskloader MFS. But this will be eventually sent over via "tmcc loadinfo" so that we can set the attribute on a per-node-type or per-node basis.
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