[9] Review request: 8154203: Use StackWalker instead of the now-deprecated sun.reflect.Reflection class

[Kevin Rushforth]

Hi Vadim,

Please review:

https://bugs.openjdk.java.net/browse/JDK-8154203
http://cr.openjdk.java.net/~kcr/8154203/webrev.00/

It's a straight-forward fix to replace Reflection::getCallerClass with 
StackWalker::getCallerClass and remove the (no longer needed) 
CallerSensitive annotation.

-- Kevin