8253905: Update sanity test suite to not place windows at (0,0)

Reviewed-by: shurailine, serb

Author: amresh-sahu

test/jdk/sanity/client/lib/SwingSet3/src/com/sun/swingset3/demos/dialog/DialogDemo.java

@@ -154,6 +154,7 @@ public void run() {
                 frame.add(demo);
                 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                 frame.pack();
+                frame.setLocationRelativeTo(null);
                 frame.setVisible(true);
                 demo.start();
             }

test/jdk/sanity/client/lib/SwingSet3/src/com/sun/swingset3/demos/frame/FrameDemo.java

@@ -264,6 +264,7 @@ public void run() {
 frame.add(demo);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.pack();
+frame.setLocationRelativeTo(null);
 frame.setVisible(true);
 demo.start();
 }

test/jdk/sanity/client/lib/SwingSet3/src/com/sun/swingset3/demos/table/TableDemo.java

@@ -615,6 +615,7 @@ public void run() {
                 TableDemo demo = new TableDemo();
                 frame.add(demo);
                 frame.setSize(700, 400);
+                frame.setLocationRelativeTo(null);
                 frame.setVisible(true);
                 demo.start();
             }

test/jdk/sanity/client/lib/SwingSet3/src/com/sun/swingset3/demos/window/WindowDemo.java

@@ -152,6 +152,7 @@ public static void main(String args[]) throws InterruptedException, InvocationTa
             WindowDemo demo = new WindowDemo();
             frame.add(demo);
             frame.pack();
+            frame.setLocationRelativeTo(null);
             frame.setVisible(true);
             demo.start();
         });