reimplement and document auth.conf

We have support for an netrc-like auth.conf file since 0.7.25 (closing
518473), but it was never documented in apt that it even exists and
netrc seems to have fallen out of usage as a manpage for it no longer
exists making the feature even more arcane.

On top of that the code was a bit of a mess (as it is written in c-style)
and as a result the matching of machine tokens to URIs also a bit
strange by checking for less specific matches (= without path) first.
We now do a single pass over the stanzas.

In practice early adopters of the undocumented implementation will not
really notice the differences and the 'new' behaviour is simpler to
document and more usual for an apt user.

Closes: #811181

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