tor-relay-crypto: Add a denotator to RelaySigningKeypairSpecifier.
The new Iso8601TimeSlug
slug type from tor-persist
represents a timestamp that can be safely encoded in a file name.
RelaySigningKeypairSpecifier
now contains a "key denotator" that is a Iso8601TimeSlug
, which will enable us to store more than one K_relaysign_ed
in the keystore (IOW, we enocde a timestamp in the ArtiPath
of these keys, so each new K_relaysign_ed
will have a different path).
Closes #1692 (closed)