Adjust new test case to set wal_keep_segments.

Robert Haas <rhaas@postgresql.org>

Commit: 1c2c6a9a299c4b26c46b48a178a431c0ba21cebd
Author: Robert Haas <rhaas@postgresql.org>
Date: 2021-06-10T13:48:07Z
Releases: 10.18
Adjust new test case to set wal_keep_segments.

Per buildfarm member conchuela and Kyotaro Horiguchi, it's possible
for the WAL segment that the cascading standby needs to be removed
too quickly. Hopefully this will prevent that.

Kyotaro Horiguchi

Discussion: http://postgr.es/m/20210610.101240.1270925505780628275.horikyota.ntt@gmail.com

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