[Xmldatadumps-l] huwiki, arwiki to be treated as 'big wikis' and run parallel jobs

[Ariel Glenn WMF]

Starting September 1, huwiki and arwiki, which both take several days to
complete the revsion history content dumps, will be moved to the 'big
wikis' list, meaning that they will run jobs in parallel as do frwiki,
ptwiki and others now, for a speedup.

Please update your scripts accordingly. Thanks!

Task for this: https://phabricator.wikimedia.org/T202268

Ariel