Postgres, fix a bunch of schema dump and enum tests

Author: JesseChavez

lib/arjdbc/postgresql/adapter.rb

@@ -345,7 +345,7 @@ def enum_types
           type.typname AS name,
           type.OID AS oid,
           n.nspname AS schema,
-          string_agg(enum.enumlabel, ',' ORDER BY enum.enumsortorder) AS value
+          array_agg(enum.enumlabel ORDER BY enum.enumsortorder) AS value
         FROM pg_enum AS enum
         JOIN pg_type AS type ON (type.oid = enum.enumtypid)
         JOIN pg_namespace n ON type.typnamespace = n.oid