RFR: JDK-8085822 JEP 223: New Version-String Scheme (initial integration)

[Magnus Ihse Bursie]

This review request covers the main part of the work for JEP-223, the 
new version string format [1]. Basically, we'll call this release Java 
"9", instead of Java "1.9.0".

This patch is a folding of all work that has been done so far in the 
branch JEP-223-branch in jdk9/sandbox. As you can see, it mostly covers 
build changes, with some code changes in hotspot, jdk, nashorn and 
langtools that either are corresponding changes in the product code due 
to the compiler define flags changing from the build, or follow-up 
changes to handle the new format.

The JEP-223 work is not finished by this patch. In fact, there are known 
issues remaining even after this patch, typically by code that reads the 
"java.version" property and tries to parse it. However, this patch is 
not directly destined for jdk9/dev, but will go into the special 
verona/stage forest. As for all patches destined for verona/stage it 
will be code reviewed as if going to jdk9/dev. Once in verona/stage it 
will bide its time, and it will be complemented with follow-up patches 
to address remaining issues. When all such issues are resolved and 
JEP-223 is fully implemented, all changes will be pushed at once 
(without further code reviews) into jdk9/dev.

This patch has been contributed by Magnus Ihse Bursie, Kumar Srinivasan 
and Alejandro Murillo.

Bug: https://bugs.openjdk.java.net/browse/JDK-8085822
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8085822-JEP-223-initial-patch/webrev.01

[1] http://openjdk.java.net/jeps/223