The current client checks for superuser before attempting to
execute pg_repack commands. In Amazon RDS, customers are given
access to a psuedo-superuser role called rds_superuser, but they
are not given access to superuser. However, rds_superusers will
otherwise have the ability to execute pg_repack commands in RDS.
This change introduces the --no-superuser-check option in the
client code so that users can disable the client-side superuser
checks.
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