RFR: JDK-8209381: Default CDS classlist generation should run with an explicit locale setting

[Erik Joelsson]

Hello,

Please review this fix for the default CDS classlist generation. This 
patch adds an explicit English locale to the generation command to make 
the build less dependent on the locale it is running in, and produce the 
same classlist regardless.

Thanks to Ioi who helped me verify that the patch actually works.

Bug: https://bugs.openjdk.java.net/browse/JDK-8209381

Webrev: http://cr.openjdk.java.net/~erikj/8209381/webrev.01/index.html

/Erik