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.
Bilibili now uses emscripten, which is very difficult for reverse
engineering. I don't expect it to be fixed in near future, so I mark
it as broken.
Ref: #10375
All starts from #10363. The test case in mtvservices:embedded uses
config.xml, while the video from #10363 and the test case in generic.py
is broken. Both uses index.html for fetching the feed URL.