RFR: JDK-8233333: Incorrect comparison of number version strings in ToolValidator

[Alexey Semenyuk]

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).

Additionally:
- fixed issue with truncated log output of jtreg tests (added 
maxOutputSize=2000000 to TEST.properties)
- fixed issue in code looking up for WiX Toolkit when environment 
variables are not set

- Alexey

[1] https://bugs.openjdk.java.net/browse/JDK-8233333

[2] http://cr.openjdk.java.net/~asemenyuk/8233333/webrev.00