Back-port a few PostgresNode.pm methods.

Robert Haas <rhaas@postgresql.org>

Commit: 75212a854f991689fd6acbd51536a2912bf7461b
Author: Robert Haas <rhaas@postgresql.org>
Date: 2021-06-09T20:16:21Z
Releases: 9.6.23
Back-port a few PostgresNode.pm methods.

The 'lsn' and 'wait_for_catchup' methods only exist in v10 and
higher, but are needed in order to support a test planned test
case for a bug that exists all the way back to v9.6. To minimize
cross-branch differences in the test case, back-port these
methods.

Discussion: http://postgr.es/m/CA+TgmoaG5dmA_8Xc1WvbvftPjtwx5uzkGEHxE7MiJ+im9jynmw@mail.gmail.com

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src/test/perl/PostgresNode.pm modified +83 −0

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