RFR: JDK-8223953: Fix CLASSPATH parsing for sub-directorys containing spaces

[Andy Herrick]

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

This is a fix for the JDK-8200758-branch branch of the open sandbox 
repository (jpackage).

[1] https://bugs.openjdk.java.net/browse/JDK-8223953
[2] http://cr.openjdk.java.net/~herrick/8223953/

/Andy