Update dir-spec descriptor cosmetic difference criteria (12 hours -> 2 hours)
In section 3.2 of the dir-spec document it says:
If the authority _does_ have a descriptor with the same public key, the newly uploaded descriptor is remembered if its publication time is more recent than the most recent old descriptor for that router, and either: - There are non-cosmetic differences between the old descriptor and the new one. - Enough time has passed between the descriptors' publication times. (Currently, 12 hours.)
This value of 12 hours was change in commit cc351578 to 2 hours.
In addition, a comment in the tor code still says 12 hours.
This ticket covers two changes:
- update the dir-spec to say 2 hours
- update a comment in the tor code
Will attach two PRs shortly.
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