[mtv] Add support full award shows

[RuneMagle]

• I've verified and I assure that I'm running youtube-dl 2017.05.07
• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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C:\Users\Desktop\youtube-dl>youtube-dl.exe -f best --all-subs http://www.mtv.com/full-episodes/8i7aff/2017-movie-tv-awards-2017-mtv-movie-tv-awards-full-show -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'best', '--all-subs', 'http://www.mtv.com/full-episodes/8i7aff/2017-movie-tv-awards-2017-mtv-movie-tv-awards-full-show', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2017.05.07
[debug] Python version 3.4.4 - Windows-10-10.0.14393
[debug] exe versions: ffmpeg N-82833-gedb4f5d, ffprobe N-82833-gedb4f5d, rtmpdump 2.3
[debug] Proxy map: {}
[mtv] 2017-movie-tv-awards-2017-mtv-movie-tv-awards-full-show: Downloading webpage
[mtv] d7f96bad-d511-4fee-afb2-34ed4ec599b3: Downloading info
ERROR: Unable to download XML: HTTP Error 500: Internal Server Error (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpt73_83v_\build\youtube_dl\extractor\common.py", line 502, in _request_webpage
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpt73_83v_\build\youtube_dl\YoutubeDL.py", line 2106, in urlopen
  File "C:\Python\Python34\lib\urllib\request.py", line 470, in open
  File "C:\Python\Python34\lib\urllib\request.py", line 580, in http_response
  File "C:\Python\Python34\lib\urllib\request.py", line 508, in error
  File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
  File "C:\Python\Python34\lib\urllib\request.py", line 588, in http_error_default
...
<end of log>

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• Single video:(Doesn't work) http://www.mtv.com/full-episodes/kcevea/2017-woodies-2017-mtv-woodies-full-episode
  -Single video:(Doesn't work) http://www.mtv.com/full-episodes/8i7aff/2017-movie-tv-awards-2017-mtv-movie-tv-awards-full-show
• Single video: (Works) http://www.mtv.com/episodes/3u2n3j/nick-cannon-presents-wild-n-out-samantha-hoopes-russell-peters-don-benjamin-jeremih-season-8-ep-815

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Description of issue

It seems that yt-dl won't download full shows, like MTV Movie & TV Awards & Woodies. Full episodes are working just fine.