pgsql: Remove reindex_catalog test from test schedules.

Remove reindex_catalog test from test schedules.

As none of the approaches for avoiding the deadlock issues seem
promising enough, and all the expected reindex related changes have
been made, apply 60c2951e1bab7e to master as well.

Discussion: https://postgr.es/m/4622.1556982247@sss.pgh.pa.us

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/5997a8f4d7478ae6bac4dab12ca1f883e41a7aa1

Modified Files
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src/test/regress/expected/reindex_catalog.out | 9 +++++++--
src/test/regress/parallel_schedule            | 5 -----
src/test/regress/serial_schedule              | 1 -
src/test/regress/sql/reindex_catalog.sql      | 9 +++++++--
4 files changed, 14 insertions(+), 10 deletions(-)