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+im9jy...@mail.gmail.com

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/75212a854f991689fd6acbd51536a2912bf7461b

Modified Files
--------------
src/test/perl/PostgresNode.pm | 83 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)

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