pgsql: Modify query on pg_hba_file_rules to check for errors in regress

Modify query on pg_hba_file_rules to check for errors in regression tests

The regression tests include a query to check the execution path of
pg_hba_file_rules, but it has never checked that a given cluster has
correct contents in pg_hba.conf. This commit extends the query of
pg_hba_file_rules to report any errors if anything bad is found. For
EXEC_BACKEND builds, any connection attempt would fail when loading
pg_hba.conf if any incorrect content is found when parsed, so a failure
would be detected before even running this query. However, this can
become handy for clusters where pg_hba.conf can be reloaded, where new
connection attempts are not subject to a fresh loading of pg_hba.conf.

Author: Julien Rouhaud, based on an idea from me
Discussion: https://postgr.es/m/YkFhpydhyeNNo3Xl@paquier.xyz

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/091a971bb59ca9751f32a4aa5aee969c5a915754

Modified Files
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src/test/regress/expected/sysviews.out | 11 ++++++-----
src/test/regress/sql/sysviews.sql | 5 +++--
2 files changed, 9 insertions(+), 7 deletions(-)