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

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