Remove old, unused update-server script

(imported from commit 45e6923859bd008d66f555eaea286425a6578562)

servers/update-server

@@ -1,10 +0,0 @@
-#!/bin/bash
-
-machinetype=$(cat /etc/humbug-machinetype | sed -e 's/\n$//')
-if [ -z "$machinetype" ]; then
-    echo "No /etc/humbug-machinetype file found."
-    echo "Please create it and then re-run this script."
-    exit 1
-fi
-
-puppet apply -e "class {'humbug': machinetype => '$machinetype'}"