up-to-date check on dirinfo doesn't consider networkstatus freshness

Deferred from 0.1.2.x:

? - Bug: combination of things: When we've been idle a long time, we stop fetching server descriptors. When we then get a socks request, we build circuits immediately using whatever descriptors we have, rather than waiting until we've fetched correct ones.

[Automatically added by flyspray2trac: Operating System: All]

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