Dmitrii Metelkin authored Dec 07, 2016 and Robert Lyon committed Dec 09, 2016

Also, update mp4_video type to mp4 in the internalmedia block
configuration settings.

And, remove the id column from the artefact_file_mime_types table. It's
not required with the addition of the primary key made up of the
mimetype and description columns.

behatnotneeded

Change-Id: I607ec4aaabf8edb6fa5fa9731890a40ac62a0af0