Merge branch 'VideoSprint40' into vid-1222
Video (vid-1222): VideoUploader - allow to pass thumbnail url
Video (vid-1222): IVA - set label and add thumbnail to custom metadata in ooyala if thumbnail url is empty
Video (vid-1222): IVA - add maintenance script to update thumbnail
Video (vid-1222): IVA - add maintenance script to update thumbnail
Merge pull request #2660 from Wikia/vid-1222

VID-1222: Add maintenance script to check for missing thumbnails and reingest thumbnails to Ooyala and WV