Tidy up repetition in PG HA database `gitlab.rb`
https://docs.gitlab.com/ee/administration/high_availability/alpha_database.html#database-nodes
postgresql['sql_user_password'] = 'POSTGRESQL_PASSWORD_HASH'
Exists twice, once before the # START user configuration
marker. As it's a hash-based data structure this is probably OK, but it's untidy and might cause confusion.
Context: https://gitlab.com/gitlab-org/build/team-tasks/issues/14#note_46752600
Edited by Richard Clamp