Force hash joins to be enabled in the hash join regression tests.

Thomas Munro <tmunro@postgresql.org>

Commit: 5526baf54902a56c5bc1b4abe625acb33d7357bf
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2019-07-09T06:30:37Z
Releases: 12.0
Force hash joins to be enabled in the hash join regression tests.

Otherwise the regressplans.sh tests generate extremely slow nested
loop joins.  Back-patch to 11 where the hash join tests came in.

Reported-by: Michael Paquier
Discussion: https://postgr.es/m/20190708055256.GB2709%40paquier.xyz

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