Sync up with upstream parserTests.

We have one new html2wt failure on the blacklist, but note that it fits
right in with all the other 'External image' html2wt failures.  Basically
Parsoid needs the rel="mw:ExtLink" to know whether to serialize links with
[[ ]] brackets or not.

Change-Id: I9293a50cd8d74f34eee52b1004311e21aeda4399