Evaluate correctness of log messages wrt dirmgr behavior.

2023-03-31T14:57:06.485574Z  INFO tor_dirmgr::state: The current consensus is fresh until 2023-03-30 12:00:00.0 +00:00:00, and valid until 2023-03-30 14:00:00.0 +00:00:00. I've picked 2023-03-30 13:16:16.933280954 +00:00:00 as the earliest time to replace it.
2023-03-31T14:57:06.485837Z  INFO tor_dirmgr: Marked consensus usable.

We should make sure those messages are right; they're at info, and potentially confusing.