Add node attribute for specifying bootinfo server
Add the bootinfo_server attribute for specifying the bootinfo server the node should use during the boot process. If not specified the node will default to trying the tftp server and dhcp server, in that order. PXE vendor option 128 is used to communicate this to the NBP. Options 128-254 are available for NBP-specific use according to the PXE spec, so we're safe using it.
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