868be00 Start keeping track of key lifetimes and usage

Authored and Committed by nalin 4 years ago
    Start keeping track of key lifetimes and usage
    
    Start tracking the dates on which we generated a key pair (if we did it)
    and how many times we've sent requests to a CA using a given public key.
    Also track the number of times we've saved certificates to disk as an
    indication of how many times the CA has issued us a certificate for that
    public key.
    
        
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