cabal-install: Legacy uris and upload --check

[Antoine Latter]

cabal-dev,

I found it difficult to test out a local install of hackage due to the
way that cabal-install redirects to 'legacy' URIs, and the fact that
upload --check points to a hard-coded path.

So attached is a patch which does two things:

 - Previously, only hackage.haskell.org could count as a legacy repo
path, now localhost can also count. It's still a bit arbitrary, tough.
 - When not using a legacy repo URI, upload --check posts to
<repo>/check, which is what the happstack-based hackage-server
expects. This is similar to what we do for the upload command already.

If folks would like the second half without the first, I can put
together a new patch.

Side effects of this patch:

+ Anyone running with a third-party repo in their cabal config file
will get unexpected behavior with 'upload --check'. Previously this
would have always hit hackage.haskell.org.

+ Anyone running with a repo URI of the format
'localhost/packages/archive' will now be posting 'cabal upload'
commands to localhost/cgi-bin/protected/upload instead of
localhost/packages/archive/upload.

Take care,
Antoine
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