Channel9 RSS support

[splendid25]

• I've verified and I assure that I'm running youtube-dl 2016.06.02

Before submitting an issue make sure you have:

• 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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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

C:\Temp>youtube-dl -v https://channel9.msdn.com/Niners/Splendid22/Queue/76acff796e8f411184b008028e0d492b/RSS > rss.log 2>&1
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v', 'https://channel9.msdn.com/Niners/Splendid22/Queue/76acff796e8f411184b008028e0d492b/RSS']
[debug] Encodings: locale cp1252, fs mbcs, out cp1252, pref cp1252
[debug] youtube-dl version 2016.06.02
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: none
[debug] Proxy map: {}
[channel9] Niners/Splendid22/Queue/76acff796e8f411184b008028e0d492b/RSS: Downloading web page
[channel9] Niners/Splendid22/Queue/76acff796e8f411184b008028e0d492b/RSS: Downloading RSS
ERROR: Unable to download XML: HTTP Error 404: Not Found (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\tmpqoaker5v\build\youtube_dl\extractor\common.py", line 388, in _request_webpage
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpqoaker5v\build\youtube_dl\YoutubeDL.py", line 1946, 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 502, in error
  File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
  File "C:\Python\Python34\lib\urllib\request.py", line 685, in http_error_302
  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

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Queue : https://channel9.msdn.com/Niners/Splendid22/Queue/76acff796e8f411184b008028e0d492b/RSS
• Event : https://channel9.msdn.com/Events/DEVintersection/DEVintersection-2016/RSS
• Speaker : https://channel9.msdn.com/Events/Speakers/scott-hanselman/RSS?UrlSafeName=scott-hanselman

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Description of your issue, suggested solution and other information

Hello, I would like to be able to download a RSS link (my personal queue, as a watchlist) on Channel 9.
The personal queue is private in my profile but can be accessed by its public RSS feed. But the extractor doesn't handle a RSS link directly.

The thing is, the method _extract_list automatically adds /RSS at the end of the URL, even if it already contains it.
Actually, the method _real_extract could skip the call to _download_webpage when the URL already contains /RSS.

Thank you.