Find way to silence hachoir_* modules

[jhallard]

Currently they spam to stdout about some errors while decoding test videos to get the duration, the odd thing is, they end up getting the duration just fine but still spit out these warnings.

$ python import_video.py --folder ~/natconv_small/ --host 192.168.1.13 --port 8080 --hook_module ~/examples/batch_import/camio_hooks.py --regex ".*/(?P<camera>\w+?)\-.*\-(?P<epoch>\d+)\.mp4" --hook_data_json '{"plan": "PlUs"}'
INFO:root:submitted hooks module: '/Users/john/examples/batch_import/camio_hooks.py'
INFO:root:camera_name: C2_Hi20161009
INFO:root:epoch: 1476018757
INFO:root:/Users/john/natconv_small/C2_Hi20161009-131237-1476018757.mp4 (scheduled for upload)
[warn] [<MovFile>] Error when getting size of 'atom[2]': delete it
[warn] [<MovFile>] Extended size is not supported!
[warn] [<MovFile>] [Autofix] Fix parser error: stop parser, add padding
INFO:root:1/1 uploading /Users/john/natconv_small/C2_Hi20161009-131237-1476018757.mp4
INFO:root:completed
INFO:root:finishing up...
INFO:root:Job ID: agxzfmNhbWlvLXRlc3RyEAsSA0pvYhiAgKDIhYD4CQw

It'd be nice if we could find a way to shut them up, I looked briefly through the documentation but didn't see anything that pointed me in the right direction, might have to go into the source code of the module and see if we can NULL or turn off an internal logger for them.

Low priority but if we can get it done it will clean up the importer output a bit.