tor/changes/bug21641

  o Minor feature (defaults, directory):
    - Onion key rotation and expiry intervals are now defined as a network
      consensus parameter as per proposal #274. The default lifetime of an
      onion key is bumped from 7 to 28 days. Old onion keys will expire after 7
      days by default. Fixes bug #21641.
Add periodic timer for expiring old onion keys. This patch adds a new timer that is executed when it is time to expire our current set of old onion keys. Because of proposal #274 this can no longer be assumed to be at the same time we rotate our onion keys since they will be updated less frequently. See: https://bugs.torproject.org/21641 2017-03-10 13:00:20 +01:00			`o Minor feature (defaults, directory):`
			`- Onion key rotation and expiry intervals are now defined as a network`
			`consensus parameter as per proposal #274. The default lifetime of an`
			`onion key is bumped from 7 to 28 days. Old onion keys will expire after 7`
			`days by default. Fixes bug #21641.`