Adjust new test case to set wal_keep_segments.

Robert Haas <rhaas@postgresql.org>

Commit: 534b9be805b4eac83d059c577021ec57df896c08
Author: Robert Haas <rhaas@postgresql.org>
Date: 2021-06-10T13:43:35Z
Releases: 11.13
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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