RFR JDK-8042887: Remove serialver -show, this tool does not need a GUI

[Pavel Rappo]

Hi everyone,

could you please review my change for JDK-8042887?

http://cr.openjdk.java.net/~alanb/8042887/webrev/

I also created following issues for appropriate docs/localization updates:

https://bugs.openjdk.java.net/browse/JDK-8043613
https://bugs.openjdk.java.net/browse/JDK-8043620

Thanks
-Pavel