Mark descriptors as undownloadable when dirserv_add_() rejects them

As of ac2f6b608a18a8595f62384788196d7c3f2875fd in 0.2.1.19-alpha,
Sebastian fixed bug 888 by marking descriptors as "impossible" by
digest if they got rejected during the
router_load_routers_from_string() phase. This fix stopped clients
and relays from downloading the same thing over and over.

But we never made the same change for descriptors rejected during
dirserv_add_{descriptor,extrainfo}.  Instead, we tried to notice in
advance that we'd reject them with dirserv_would_reject().

This notice-in-advance check stopped working once we added
key-pinning and didn't make a corresponding key-pinning change to
dirserv_would_reject() [since a routerstatus_t doesn't include an
ed25519 key].

So as a fix, let's make the dirserv_add_*() functions mark digests
as undownloadable when they are rejected.

Fixes bug 22349; I am calling this a fix on 0.2.1.19-alpha, though
you could also argue for it being a fix on 0.2.7.2-alpha.

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