Add some unit test cases for backup tasks.

coulbeck

14.41.2006 21cf19d0b49b67163ed8efc653a49f6c51bfb470

 opends/ext/testng/testng.xml

@@ -12,6 +12,7 @@
            <package name="org.opends.server.schema"/>
            <package name="org.opends.server.monitors"/>
            <package name="org.opends.server.extensions"/>
            <package name="org.opends.server.tasks"/>
        </packages>
    </test>