roots: a peer contradicting --genesis-root refused at the handshake

Review 3, R5: a node given its root (--genesis-root) refused a peer
naming another only change by change while its document was empty,
each with an entry among the refused; the handshake went through, as
there was no root of its own yet to compare with. The root given is
now compared too: a peer naming another is refused at the handshake,
logged once, as one whose document starts from another root.

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