Properly escape the per-node STONITH parameters

https://bugzilla.novell.com/show_bug.cgi?id=888637
Ok, so there are multiple usable functions...

```javascript
function htmlEntities(str) {
  return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
}
```

```javascript
function krEncodeEntities(s) {
  return $j("<div/>").text(s).html();
}
function krDencodeEntities(s) {
  return $j("<div/>").html(s).text();
}
```

It's up to @vuntz to use one of that :)