Don't try to link to mp3 flavors from kaltura
Don't try to link to mp3 flavors from kaltura

refs: CNVS-12293
refs: CNVS-12998

This commit needs to go out with changeid:
I5b77f58133fb9081909771d50bb8f0a91db23d63
because it fixes audio playback in firefox.

it is it's own commit so that if we fix our mp3s
being served from kaltura (this ticket: CNVS-12998)
, we can just revert this one commit.

long story:
all our browsers except firefox will allow
<audio><source type="video/mp4" src="blah.mp4"></audio>
...and play back the audio inside the mp4 container

but firefox won't, so it was falling back to the
last of the options returned by /media_objects/<id>/info;
an 'audio/mp3' url. but the thing that url points to
right now in production
(e.g.: http://www.instructuremedia.com/p/100/sp/10000/download/entry_id/0_4b4pgy5p/flavor/0_092j8kek/ks/NWRiYzk5Njk2MTRjZTlhYWEwODBkYjVlOWQ2MTc2MzZmMGNhMDc0MHwxMDA7MTAwOzEzOTk2NzM4NjI7MDsxMzk5NTg3NDYyLjkwNzg7O2Rvd25sb2FkOjBfNGI0cGd5NXA7)
just returns text/html that says:
"This URL is expired"

Change-Id: Ie9bc2551b839247042fc7f3261f82845331e04fc
Reviewed-on: https://gerrit.instructure.com/34748
Reviewed-by: Sterling Cobb <7a57d889ea7f266299434459898a90c7f6a1ca4d@instructure.com>
QA-Review: Clare Strong <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Product-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Paul Hinze <4750e031e77b9a66270d86f487e0d12ea4126f1c@instructure.com>

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