[mtvservices:embedded] Use another endpoint to get feed URL
Closes #10363 In the original mtvservices:embedded test case, config.xml is still used to get the feed URL. Some other examples, including test_Generic_40 (http://www.vulture.com/2016/06/new-key-peele-sketches-released.html), and the video mentioned in #10363, use another endpoint to get the feed URL. The 'index.html' approach works for the original test case, too. So I didn't keep the old approach.
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