Ensure all index files sent custom tags to the methods

The mirror method can distribute requests for files based on various
metadata bits, but some – the main index files – weren't actually
passing those on to the methods as advertised in the manpage.

This is hidden both by mirror usually falling back to other sources
which will eventually hit the right one and that if the repository does
not support by-hash apt will automatically stick to the mirror which was
used for the Release file.

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