WebUI: server-bulkupload: Provide TSV templates.

Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
I think it's too deep nest and hard to understand.
How about extracting the map function like this?:

```js
var buildRow = function(val, idx) {
  ...
}
var tsvTemplate = $.map(tsvHeaderRows, buildRow).join('\n');
```