Add basic unit-test for changelog

lutoff

21.43.2006 fc6afde41ec2f24e5402207c81f4203e77ae133e

 opends/ext/testng/testng.xml

@@ -17,6 +17,7 @@
            <package name="org.opends.server.tasks"/>
            <package name="org.opends.server.plugins"/>
            <package name="org.opends.server.types"/>
            <package name="org.opends.server.changelog"/>
        </packages>
    </test>