Adjust new test case to set wal_keep_segments.

Robert Haas <rhaas@postgresql.org>

Commit: 6cd0e55f9ffb3be400e44812fa6163a217e09bf3
Author: Robert Haas <rhaas@postgresql.org>
Date: 2021-06-10T13:51:00Z
Releases: 9.6.23
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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