Fix the server-executable file security checks.
Review Request #880 - Created Sept. 21, 2017 and updated
We have a security check that ensures the server isn't able to execute uploaded file attachments. A change a while back regressed the checks, due to usage of `build_server_url()`. The check was passing in multiple path components to this method, which then get forwarded to `urljoin()`. However, `urljoin()` only accepts two components in total (one of which is the root URL of the server). This meant that the filename being checked was being passed as the `allow_fragments` keyword argument instead, and the URL being downloaded was actually the root `media/uploaded/files/` path, causing the checks to always fail. This fixes the function signature and docs to `build_server_url()` to ensure that it will always accept only a single path, and fixes the check to pass the correct path to the file. Testing Done: Unit tests pass. Verified that the paths being built for the security checks were correct, and that the security checks were providing the correct results. Reviewed at https://reviews.reviewboard.org/r/9155/
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