RFR: 8072379: Implement jdk.Version and jdk.OracleVersion

[Iris Clark]

Hi.

Please review the new classes jdk.Version and jdk.OracleVersion.  These are
simple Java APIs to parse, validate, and compare version numbers.

  Bug

    8072379: Implement jdk.Version and jdk.OracleVersion
    https://bugs.openjdk.java.net/browse/JDK-8072379

  Webrev

    http://cr.openjdk.java.net/~iris/verona/8072379/webrev.1/

  JavaDoc

    http://cr.openjdk.java.net/~iris/verona/8072379/doc.1/jdk/Version.html
    http://cr.openjdk.java.net/~iris/verona/8072379/doc.1/jdk/OracleVersion.html

The .java files are predominantly javadoc. The code is relatively
straight-forward.

jdk.Version is the representation of the JDK version string as described in
JEP 223 ([0], 8061493).  The javadoc is largely taken from the description
section in the JEP.  The API is described in the "API" section.

jdk.OracleVersion extends jdk.Version and is the representation of the Oracle
JDK version string.  Its only purpose is to interpret the fourth element of
the version number as a patch release.

There are some minor discrepancies between the implementation and the JEP.
The JEP will need to be updated.  The most notable is the name of the package
("jdk" vs. the original "jdk.util").  The rename was recommended by Mark.

Thanks,
iris
 
[0] http://openjdk.java.net/jeps/223