Video (vid-1027): update functions to reupload thumbnail if the thumbnail is default thumbnail
Video (vid=1027): add functions to set image data when thumbnail is reset
Video (vid-1032): update maintenance scipt to update thumbnail data
Video (vid-1027): add maintenance script to update thumbnail (reupload thumbnail and update image data)
Video (vid-1027): rename function in maintenance script
Merge pull request #2067 from Wikia/vid-1032

VID-1027: replace all default video thumbnails with actual thumbnails