Updated mediawiki/extensions
Project: mediawiki/extensions/CirrusSearch  fe4d4d916ded6cff6529d6863ad3566a653f72bb

Move CacheWarmers & ShardAllocation validators into own folder

Makes them extend a shared base class for consistency.
Others will follow, so we can pull all validation code out of
updateOneSearchIndexConfig.php

Change-Id: Iabd19d2f5123fe5217d391950d9e919ae4a6f63c