[mtv] Transform the urls from the mobile version to get the best quality

And don't report a warning, just log a message, it allows to pass the test from Europe.
[gamekings] Modernize and update the test's description field
[ustream:channel] Update test's number of entries
[soundcloud] Add the description field to the second test
[vube]  Update the test's checksum
[videodetective] Modernize