dir server responses should include a Date: header even when not responding 200
Catalyst noticed that when the Tor client fetches a consensus from moria1 but moria1 responds "302 Not modified", moria1 does not include a Date: header in that response. So a Tor client whose clock is wrong won't be told about it at this stage.
The fix is that all dir responses should include the Date: header, not just 200 responses.
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