Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  6525c995cc8fb7e9a88f49995c5378751f16307a

Fix wrong response from new-topic using redis

The MemcachedBagOStuff and RedisBagOStuff interfaces do
not match, specifically the getMulti method of memcached
does not return unfound keys, where the redis one returns
the key set to false.

Change-Id: I6d81d4a1bc6745e9894ba525de258a970f3d8d94