RCLConsensus::Adaptor::onClose

Close the open ledger and return initial consensus position.

Result
onClose(
    RCLCxLedger const& ledger,
    NetClock::time_point const& closeTime,
    ConsensusMode mode);

Name	Description
`ledger`	the ledger we are changing to
`closeTime`	When consensus closed the ledger
`mode`	Current consensus mode

Tentative consensus result