examples: make main loops finite to ensure proper cleanup

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/java/GpioRead6.java

@@ -46,7 +46,7 @@ public class GpioRead6 {
 
         gpio.dir(Dir.DIR_IN);
 
-        while (true) {
+        for (int i = 100; i > 0; --i) {
             System.out.format("Gpio is %d\n", gpio.read());
             Thread.sleep(1000);
         }