Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  55476e8e6553a12f0ea9a1c9957dd45698498202

Allow Flow to connect to separate DB cluster

This should be backwards compatible: default cluster value of false should load
the core database (where we currently only write data to)

With this, we can now setup Flow data on a separate database.
1 known caveat: update.php will for now always apply patches to core DB, so it
can't be used to patch Flow queries if the data lives somewhere else. We should
get that addressed some time.

Change-Id: I5ec7f3252903a54f82ee9ca4c8aada3ccf0e70c1