New test for kaltura embeds breaking test suite by timing out

[anisse]

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The test introduced after bug report #9911 in 427cd05 (ping @dstftw )is timing out on travis, see:
https://travis-ci.org/anisse/youtube-dl/jobs/140447718
https://travis-ci.org/rg3/youtube-dl/jobs/140429523

[anisse]

You can also see that the build times since push are much shorter:
https://travis-ci.org/rg3/youtube-dl/builds

Since now travis is stopping the build very early before the end because there's no output for 10min.