Datafederation quick start needs materialization teiid_rel:MATVIEW_AFTER_LOAD_SCRIPT changed to match docs

The data federation quick start does not demonstrate the same way of loading in the materialized table by executing multiple statements when "teiid_rel:MATVIEW_AFTER_LOAD_SCRIPT" is performed, as the doc's do (based on the latest changes).

It should now use the following to work like the doc's prescribe:

"teiid_rel:MATVIEW_AFTER_LOAD_SCRIPT" 'execute accounts.native(''ALTER TABLE h2_stock_mat RENAME TO h2_stock_mat_temp'');execute accounts.native(''ALTER TABLE mat_stock_staging RENAME TO h2_stock_mat'');execute accounts.native(''ALTER TABLE h2_stock_mat_temp RENAME TO mat_stock_staging'');',