Remove defunct systemd support

Closes: #70 [via git-merge-pr]

dracut/vmklive/copy-initramfs.sh

@@ -1,9 +0,0 @@
-#!/bin/sh
-# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
-# ex: ts=8 sw=4 sts=4 et filetype=sh
-
-# Copy the initramfs back to the new rootfs for proper shutdown.
-KVER=$(uname -r)
-if [ -x /usr/bin/systemctl ]; then
-    cp /run/initramfs/live/boot/initrd $NEWROOT/boot/initramfs-${KVER}.img
-fi