[tor-bugs] #11524 [metrics-lib]: Parse new fields containing old identity keys

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#11524: Parse new fields containing old identity keys
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 Reporter:  karsten      |          Owner:  karsten
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:
Component:  metrics-lib  |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 Proposal 230 adds support for relays and bridges to migrate from one
 identity key to another.  A relay or bridge that uses this new feature
 switches to a new identity key and includes information about its old
 identity key in its server descriptor.

 In particular, the following data will be included:

  - old RSA 1024 public identity key (not SHA-1 fingerprint),
  - date and time of migration, and
  - signature of date and time of migration and new identity key
 fingerprint, made with old identity key.

 Microdescriptors will include the SHA-1 fingerprint of the old identity
 key in an `old-id` field, if the signature turned out to be valid.

 We need to parse the new fields in metrics-lib.  We'll probably also want
 to provide the SHA-1 fingerprint of the old identity key in server
 descriptor objects.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11524>
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