r/pxe: Set up a PXE server
The *pxe* role configures the TFTP and NBD stages of PXE network booting. The TFTP server provides the files used for the boot stage, which may either be a kernel and initramfs, or another bootloader like SYSLINUX/PXELINUX or GRUB. The NBD server provides the root filesystem, typically mounted by code in early userspace/initramfs. The *pxe* role also creates a user group called *pxeadmins*. Users in this group can publish content via TFTP; they have write-access to the `/var/lib/tftpboot` directory.
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