Review request for 6819886

[Alan Bateman]

6819886: System.getProperty("os.name") reports Vista on Windows 7

Webrev at:
  http://cr.openjdk.java.net/~alanb/6819886/webrev.00/

The CR synopsis says it all.  A separate CR (6820180) has been created 
to track updating HotSpot's os::print_os_info (this is used when 
emitting the system information to the fatal error log).

Thanks,
Alan.