[pgpool-committers: 9214] pgpool: Test: simplify 001.load_balance test.

[Tatsuo Ishii]

Test: simplify 001.load_balance test.

Previously we checked the version of psql, so that we could adapt the
change in psql: i.e. SHOW_ALL_RESULTS addition.
By doing:
\set SHOW_ALL_RESULTS off
in 7.sql, the test results are now identical PostgreSQL 15 and before.
As a result, expected*-pre15 files were removed.

Branch
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master

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=c2e22e7bbdf9026d46d4014c1849eda6408d8f9d

Modified Files
--------------
.../tests/001.load_balance/expected/expected7-r    |   6 +-
.../001.load_balance/expected/expected7-r-pre15    | 133 ---------------------
.../tests/001.load_balance/expected/expected7-s    |   6 +-
.../001.load_balance/expected/expected7-s-pre15    | 113 -----------------
.../tests/001.load_balance/expected/expected8-s    |   6 +-
.../001.load_balance/expected/expected8-s-pre15    | 113 -----------------
.../regression/tests/001.load_balance/sql/7.sql    |   1 +
src/test/regression/tests/001.load_balance/test.sh |  31 ++---
8 files changed, 14 insertions(+), 395 deletions(-)