8174161: [TESTBUG] Create test for SwingSet DialogDemo
Reviewed-by: serb, mrkam
Contributed-by: Vikrant Agarwal <vikrant.v.agarwal@oracle.com>

8172500: Create test for SwingSet SliderDemo
Reviewed-by: serb, mrkam
Contributed-by: Vikrant Agarwal <vikrant.v.agarwal@oracle.com>

8154381: SwingSet tests are not auto closed in jtreg
Reviewed-by: alexsch

8154594: JFrame.setDefaultCloseOperation is prohibited in jtreg: Missing part of the fix
Reviewed-by: alexsch, prr

8154365: JFrame.setDefaultCloseOperation is prohibited in jtreg
Reviewed-by: prr, alexsch

8153141: Develop initial set of tests for SwingSet
Reviewed-by: prr