unpause paused instances before terminating

tools/xen/build_domU.sh

@@ -229,6 +229,7 @@ xe vm-list --minimal name-label="$LABEL" | xargs ./scripts/uninstall-os-vpx.sh
 # Destroy any instances that were launched
 for uuid in `xe vm-list | grep -1 instance | grep uuid | sed "s/.*\: //g"`; do
     echo "Shutting down nova instance $uuid"
+    xe vm-unpause uuid=$uuid || true
     xe vm-shutdown uuid=$uuid
     xe vm-destroy uuid=$uuid
 done