Attached is a small patch that re-attempts a download when the first fetch attempt during new Feed Registration gets a 301.
The use-case was when I was trying to register my blog for Planet, I got a abc.blogspot.com feed URL whereas, in reality it was redirecting to abc.com URL instead (because I had configured BlogSpot to do so).
So although abc.blogspot.com was working on a browser (since it redirects on a 301) the Feed registration page failed with a 'Internal Server Error: Attempt to download blog feed returned status 301'.
I think this is a recoverable error, and so the patch.
NB: Am (very) new to Python, so apologies for some obvious misses.
