Hygiene: Standardise on MEDIAWIKI_URL

export MEDIAWIKI_URL=http://localhost/w/index.php
where
http://localhost/w/index.php/San Francisco is the San Francisco article
in the desktop skin

Adjust the QA tests so that they pass the useformat mobile parameter

Change-Id: I131f1d6f5ab48094fcf8818bb61ac956e14e4e62
Merge "Hygiene: Standardise on MEDIAWIKI_URL"