pgsql: Add wait_for_replay_catchup wrapper to Cluster.pm

Add wait_for_replay_catchup wrapper to Cluster.pm

This simplifies a few lines of Perl test code a bit.

Author: Bertrand Drouvot
Discussion: https://postgr.es/m/846724b5-0723-f4c2-8b13-75301ec7509e@gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/a1acdacada4aaeb233d819f519d16a9eb85a6eef

Modified Files
--------------
src/bin/pg_rewind/t/007_standby_source.pl        |  2 +-
src/test/modules/brin/t/02_wal_consistency.pl    |  2 +-
src/test/perl/PostgreSQL/Test/Cluster.pm         | 23 ++++++++++++++++++
src/test/recovery/t/001_stream_rep.pl            | 16 +++++--------
src/test/recovery/t/027_stream_regress.pl        |  3 +--
src/test/recovery/t/030_stats_cleanup_replica.pl | 20 ++++++----------
src/test/recovery/t/031_recovery_conflict.pl     | 30 ++++++++----------------
src/test/recovery/t/033_replay_tsp_drops.pl      |  6 ++---
8 files changed, 51 insertions(+), 51 deletions(-)