Bugfix in DOMUtils.convertDOMtoTokens

* If DOM node is 'html', both opening and closing tag
  tokens should be 'html'. Without this, wrapper tokens
  while dealing with DOMFragments will have a HTML opening
  tag and a wikitext closing tag. In turn, this trips up
  paragraph-wrapper when the wrapper token happens to be
  a p-tag.

* Fixes RT errors on
  hewiki:אמנת_האומות_המאוחדות_בדבר_חוזים_למכר_טובין_בינלאומי

Change-Id: If3a7fa5589f8d3e9e88280e547729da8f16d6482
Merge "Bugfix in DOMUtils.convertDOMtoTokens"