Handle linked connections better during bootstrap
begindir connections advance directly to the CLIENT_SENDING state, even before their TLS connection is created.
So we need to modify the logic from #4483 (moved) that checks for consensuses that are downloading:
- is it a direct connection in state after connecting, or
- a linked connection that's attached, or
- a linked connection that's in a state after sending
And then do the standard "extra consensus download check" when we're about to link a directory connection to a TLS connection.
Or arma may have a better idea.
I am not sure whether we should fix this in 0.2.8, because the current code works, but it's not optimal when too many TLS connections hang. Tagging it just in case.
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