Do clients need to do authority clock checks?
The current code in legacy/trac#4483 (moved) tracks if a client has done a clock check with an authority.
But it doesn't do anything with that information at the moment:
- making clients wait to contact an authority during bootstrap negates the point of fallback directories (legacy/trac#15775 (moved))
- making clients continue to contact authorities after bootstrapping risks an inadvertent DoS on the authorities.
How important are client clock checks? Do we need to launch a connection every N hours / days simply to check our clock with an authority? Is it worth the extra load on the authorities? Do we trust the clocks on fallback directories?