Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  f871fbe3e7407669bfac92a1fa3b38e22164c866

Update parserTests to match latest in mediawiki/core.

New test for "comment-only line", which we pass for everything except
html2wt.

New language variant/title conversion tests, which we fail.

Change-Id: Icb6cecfdedca72c357b6d4ebf2e6b20eb5252819