Make new regression indpendent of max_parallel_workers_per_gather.

Andres Freund <andres@anarazel.de>

Commit: 0976c4ddd4c98d64b2f3140ee96b92367b763a44
Author: Andres Freund <andres@anarazel.de>
Date: 2018-03-26T21:59:37Z
Releases: 11.0
Make new regression  indpendent of max_parallel_workers_per_gather.

The tests in e2f1eb0ee30d1 ("Implement partition-wise
grouping/aggregation.") weren't independent of the server's
max_parallel_workers_per_gather setting.  I (Andres) find it useful to
locally run with that disabled, and the aforementioned patch broke
this.

Author: Jeevan Chalke
Discussion:
    https://postgr.es/m/20180322210703.qmga3vsxqmiiypci@alap3.anarazel.de
    https://postgr.es/m/CAM2+6=UNWGKTgh9aOn4=SQ72HfFzbVFseh9=5N54bD6KB+D9OQ@mail.gmail.com

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