VID-2103 Replace raw USE statement in runOnCluster
This will fix lack of logging for which db was switched to.
VID-2103 Add Namespace to AsyncCache class
VID-2103 Load up Async Cache
VID-2103 Support Async Caching for video views
Adds wgEnableAsyncVideoViewCache to only rollout this change to select wikis before deploying 100%
VID-2103 Use wgAutoloadClasses for async cache
per @macbre
VID-2103 Make the cache key from full title hash
Merge pull request #5248 from Wikia/VID-2103

VID-2103 Async caching for views to replace cron caching