<i18n dev> Review request: JDK-8158604: test/java/util/ResourceBundle/modules/appbasic missing @test

[Mandy Chung]

Masayoshi,

test/java/util/ResourceBundle/modules/appbasic is not run because appbasic.sh was missed.  I notice it while looking at the existing tests.  I took the opportunity to improve the javadoc and update appbasic test to serve as a simple example of AbstractResourceBundleProvider.

http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8158604/

Mandy