Update (test) Wikidata, fix for json dumps and sites caching

this is a new wmf11 branch but bug fixes only vs. previous
branch deployed.

see I04ee786

Change-Id: I523a0f95f4dece53a7471bd8c90ba53cc8220ced
Merge "Update (test) Wikidata, fix for json dumps and sites caching" into wmf/1.25wmf11