NOTE: The metalink xml file points to a repomd.xml file which does not
exist. In practice librepo doesn't download this, it only uses the url
to construct the mirror urls, so it is not present.
These tests test downloading packages using metalink:
* Using a single metalink repo
* Using two metalink repos
* A bad checksum (or file) from the download which is expected to fail
* Two metalink paths with the first one returning a 404, expected to
succeed with the 2nd metalink path.
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