RFR: JDK-8245831: Unify code parsing version strings on Mac and Windows

[Alexey Semenyuk]

Please review fix [2] for jpackage bug [1].

Get rid of duplicated code parsing version strings. Move the code 
parsing version strings to dedicated classes with unit test coverage. 
Also remove Mac specific identifier setting in app's config file from 
the shared code.

- Alexey

[1] https://bugs.openjdk.java.net/browse/JDK-8245831

[2] http://cr.openjdk.java.net/~asemenyuk/8245831/webrev.00