RFR: DefaultProxySelector should use system defaults on Windows, MacOS and Gnome

[Zeller, Arno]

Hi,

can you please review my proposal for bug 8170868 - DefaultProxySelector should use system defaults on Windows, MacOS and Gnome.

Bug: 
https://bugs.openjdk.java.net/browse/JDK-8170868

Webrev:
http://cr.openjdk.java.net/~clanger/webrevs/8170868.0/

Thanks a lot,
Arno Zeller