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When tor first bootstraps, it launches two requests for authority certificates:

• one is the hinted request that goes to the directory it downloaded the consensus from (ticket?)
• one is a scheduled request that goes to a random directory

We should delay the first scheduled request slightly (5s?) to allow the first request to complete. This might be as easy as changing the first number in the authority certificate schedule from 0 to 5.

I thought we avoided fetching certificates if another fetch was in progress: clearly that doesn't happen, and maybe we don't want it to, because we don't want to wait a whole 10 seconds for it to timeout.