RFR (JAXP): 8016500 : Unlocalized warnigs.

[huizhe wang]

Hi,

This is a fix to use the existing localized messages on a warning. The 
fix is to fetch the localized messages instead of printing out 
hard-coded message in English. The locale is initialized in parser 
configuration by calling Locale.getDefault. The configuration.getLocale 
will reflect the default or that set by users.

This change has been tested by the i18n team.

webrevs:
http://cr.openjdk.java.net/~joehw/jdk8/8016500/webrev/

Thanks,
Joe