Add node_admin command for users. Simply switches between the normal
testbed boot process and the freebsd pxeboot/MFS kernel. I'm hoping this will be useful enough for users to load their own disk images, but we shall see. Usage is simple: /usr/testbed/bin/node_admin on|off pcXXX The "on" state boots the MFS, and the "off" states sets it back to normal.
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