Make bootstrapping clients wait before trying an authority
If this happens, 0 (or uninitialised data) is used instead of the zeroth schedule item. (This matters most for bridges, which have schedules that start at 60 rather than 0.)
I wonder if any of the existing Tor code does this?
We could set a flag in download_status_t to 1 in download_status_reset, then assert it's set in the low-level functions that take a download_status_t:
- (not download_status_reset, it sets the flag)