Rebalance CMS acceptance test shards

Shard 3 of the CMS acceptance tests was starting to take way longer than 1 and 2.
E.g. for a current build of master Shards 1, 2, 3: 26 min, 36 min, 41 min.

This moves about 8 minutes from shard 3 to shard 1.

@polesye FYI.
@clytwynec pls review.