add remote-shutdown script

remote-shutdown

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+sessions=$(w | sed '1,2d' | wc -l)
+
+if [ $sessions -gt 0 ] ; then
+    echo Users still logged in! Not continuing
+    exit 1
+fi
+
+# virsh inserts an additional newline, so this is the number of
+# running VMs + 1
+running_vms=$(virsh -c qemu:///system list --state-running --uuid | wc -l)
+
+if [ $running_vms -gt 1 ] ; then
+    echo VMs still running! Not continuing
+    exit 1
+fi
+
+poweroff