Extend and formalize the Moonshot hack where dhcpd sends *BOOTING events.
Since the Moonshot cluster will soon have x86 nodes and those nodes do call bootinfo (unlike the ARM nodes), make sure that bootinfo does not send PXEBOOTING/BOOTING events (since dhcpd already has) by starting it with the new -E option. Formalize by adding a BOOTINFO_EVENTS defs var that defaults to 1. This ensures that a nobootinfo version of the dhcpd.conf template is installed and that bootinfo is invoked with the -E option. Only defs-cloudlab-utah should set it to zero.
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