RFR: JDK-8050060 - Need Sample to Demonstrate Use of GPIO Pins for Input

[Jen Dority]

issue: https://bugs.openjdk.java.net/browse/JDK-8050060
webrev: http://cr.openjdk.java.net/~jld/8050060/

Hi,

Need a review for this. It's a sample app to show how to use GPIO pins 
for input.

It was used to test the fix for JDK-8049504 and won't work properly 
without it.

Thanks,
Jen