pgsql: Fix race in test of pg_switch_wal().

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pgsql: Fix race in test of pg_switch_wal().

Noah Misch-2
Fix race in test of pg_switch_wal().

The test failed when something added WAL between pg_switch_wal() and
pg_current_wal_lsn(), seen on buildfarm members hornet and sungazer.
Fix v10, v9.6 and v9.5 by making this code mirror its v13+ counterpart.
v12 and v11 lack a counterpart.

Branch
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REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/e09391a0a042a631de05faa195aea86acc66ba43

Modified Files
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src/test/recovery/t/020_archive_status.pl | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)