Changes:
   - relevant models with :search scope updated with lower casing  of the column
     values and the search parameters.
   - fixed all rubocop warnings on the changed models except
     "Style/RedundantReturn: Redundant return detected."

   Note: one could not use 'ILIKE' in WHERE clauses changed as it is not supported by MariaDB and MySql.
   Hence we use lower() in changed WHERE clauses.

 Fix for issue #2080