Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  8308517f5acbbb969e51a7fa145277a0144a7ba6

Clean up MockRepository, SiteLinkLookup and related

I found this in my stashes. It's possible that I submitted this twice.
If you find an other patch that touches the same files then please
merge *this* first. I will rebase the other later.

Change-Id: Id0c53b3e9e61ae00cbc674b9f8dbc4f82a3017f6