Add support for RFC 6842, which says the client MUST drop packets when

the server provides a client-identifier value and it doesn't match
the value the client sent.

So stop suppressing client-identifer info in the leases file and when
reading the leases file stop discarding leases that don't have current
client-identifier info. Don't use them, but keep them around in case
the client-identifier info changes back next time.

Also construct the default client-identifier (if needed) before reading
the leases file.

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