RFR: JDK-8149565: -locale option issues

[Jonathan Gibbons]

Please review a relatively simple fix to a problem that was found a 
while back relating to the handling of the -locale option.

The fix is to change some old code, that did not work on all locales 
installed in a standard JDK build, with the use of 
Locale.forLanguageTag, added in JDK 7. This method supports IETF BCP 47 
language tag strings.

The test is removed from the problem list and updated to work 
correctly.  The primary error in the test as originally written was that 
the doclet invocation would create the doclet instance in a distinct 
classloader, and thus not share static members, as was clearly the intent.

JBS: https://bugs.openjdk.java.net/browse/JDK-8149565
Webrev: http://cr.openjdk.java.net/~jjg/8149565/webrev.00/index.html

-- Jon