Recreate table deps_saved_ddl when doing db upgrade

Fix problem with collation in table deps_saved_ddl.

hive/db/sql_scripts/postgres_handle_view_changes.sql

@@ -5,6 +5,8 @@ See http://pretius.com/postgresql-stop-worrying-about-table-and-view-dependencie
 Enhanced by Wojciech Barcik wbarcik@syncad.com (handling of rules).
 */
 
+DROP TABLE IF EXISTS deps_saved_ddl;
+DROP SEQUENCE IF EXISTS deps_saved_ddl_deps_id_seq;
 
 -- SEQUENCE: deps_saved_ddl_deps_id_seq