Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  9f7ec89c52fd70e29bb3aa6be2fbc2ab2c7ad916

Some cleanup in action tests

* use TestUser
* improve variable naming
* no need to add test sites, since the test items has no site links

Change-Id: I4b5dd715994d32cf8d1ffd8352883c9969473f9b