[rubygems/rubygems] Restrict what schemes are acceptable in the remote fetcher

The remote fetcher only works with certain schemes (`http`, `https`,
`s3`, and `file`).  It's possible for other schemes to show up in this
code and it can cause bugs.

Before this patch, doing `gem install path:///hello` would result in an
infinite loop because this function would do `send "fetch_path"`,
calling itself forever.  Now we see an exception.

I think we should validate gem names earlier, but it's really best
practice to restrict the possible strings passed to `send`.

https://github.com/rubygems/rubygems/commit/54e2781b73

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