RFR: JDK-8222489: jcmd VM.system_properties gives unusable paths on Windows

[Chihiro Ito]

Hi,

Could you review this tiny fix, please?

This problem affected not the only path on Windows, but also Linux and URLs
using ":".

Webrev : http://cr.openjdk.java.net/~cito/JDK-8222489/webrev.00/
JBS : https://bugs.openjdk.java.net/browse/JDK-8222489

Regards,
Chihiro