Round doesn't restart when all contributors are dropped and there are no available replacement contributors

[kellpossible]

I'm not sure whether this functionality was originally in scope, so I've labelled it either a bug or enhancement. Either way, it seems likely that round restart has not yet been implemented.

coordinator.log:

�[2mJun 12 20:17:13.423�[0m �[31mERROR�[0m phase1_coordinator::coordinator: Unverified contribution is missing (./transcript/development/round_1/chunk_10/contribution_1.unverified)
�[2mJun 12 20:17:13.423�[0m �[31mERROR�[0m phase1_coordinator::coordinator: Coordinator failed to aggregate the current round
ContributionMissing
�[2mJun 12 20:17:13.423�[0m �[33m WARN�[0m phase1_coordinator::coordinator_state: Rolling back aggregating indicator from coordinator state
�[2mJun 12 20:17:13.423�[0m �[31mERROR�[0m aleo_setup_coordinator::operator: ContributionMissing
�[2mJun 12 20:17:18.154�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading Aleo address: "aleo1u6ammp4ramtxmgzkf33py0y5x7l3ezmws4avc9hkhftg32kwm5zqr7hp7s"
�[2mJun 12 20:17:18.154�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading signature: "a1a5bae83acb927e68ec12fc300ed3db333432f07dca4c16e02e001e46323601a4785325d687084453df593dabe3b6a3aaac3e9dd015716342c2afa44f3d3b03"
�[2mJun 12 20:17:18.154�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Verifying signature with message: "post /v1/verifier/try_lock"
�[2mJun 12 20:17:18.362�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading Aleo address: "aleo1u6ammp4ramtxmgzkf33py0y5x7l3ezmws4avc9hkhftg32kwm5zqr7hp7s"
�[2mJun 12 20:17:18.362�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading signature: "81faba37b12f8e7bf0b58774af3017302c2b277212c55481f78231d7348a2201d2a974a24a39cdac98910571a8f4222e27eeaf8c5fcc36c58dd7227ded012900"
�[2mJun 12 20:17:18.362�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Verifying signature with message: "post /v1/queue/verifier/join"
�[2mJun 12 20:17:19.357�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading Aleo address: "aleo1gpcarsysfe78mqxd7m7nfxyy53xcc4g8mq24px32azjl23228gxs4vl5rd"
�[2mJun 12 20:17:19.357�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading signature: "0be0cfcd9a2021656ae13d5634c08021efb01dbac7bceee8e253b188166a0400dc010e95f058cb3e241be66d41be20593820e4fef3e061db8434e2dea9248701"
�[2mJun 12 20:17:19.357�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Verifying signature with message: "post /v1/contributor/heartbeat"
�[2mJun 12 20:17:19.428�[0m �[32m INFO�[0m aleo_setup_coordinator::api::contributor::heartbeat: Contributor aleo1gpcarsysfe78mqxd7m7nfxyy53xcc4g8mq24px32azjl23228gxs4vl5rd.contributor successfully performed heartbeat
�[2mJun 12 20:17:23.425�[0m �[32m INFO�[0m phase1_coordinator::coordinator: 

    ----------------------------------------------------------------
    ||                        STATUS REPORT                       ||
    ----------------------------------------------------------------

    | Round 1 is finished
    | Round 1 is awaiting aggregation
    | Round 2 is awaiting participants

    | 0 contributors and 0 verifiers active in the current round
    | 0 contributors and 1 verifiers completed the current round
    | 0 chunks are pending verification

    | 1 contributors and 1 verifiers assigned to the next round
    | 1 contributors and 1 verifiers in queue for the ceremony

    | 1 participants dropped
    | 0 participants banned

    
�[2mJun 12 20:17:23.440�[0m �[31mERROR�[0m phase1_coordinator::coordinator: Unverified contribution is missing (./transcript/development/round_1/chunk_10/contribution_1.unverified)
�[2mJun 12 20:17:23.440�[0m �[31mERROR�[0m phase1_coordinator::coordinator: Coordinator failed to aggregate the current round
ContributionMissing
�[2mJun 12 20:17:23.440�[0m �[33m WARN�[0m phase1_coordinator::coordinator_state: Rolling back aggregating indicator from coordinator state
�[2mJun 12 20:17:23.440�[0m �[31mERROR�[0m aleo_setup_coordinator::operator: ContributionMissing
�[2mJun 12 20:17:23.604�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading Aleo address: "aleo1u6ammp4ramtxmgzkf33py0y5x7l3ezmws4avc9hkhftg32kwm5zqr7hp7s"
�[2mJun 12 20:17:23.604�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading signature: "6c4c26703776b7fbdd94145e5848054e990106e3e23ebf67151d37d710ec08039c8f463c19fb3880266928f88887211d75f3e645514103a88fa56cda047fa803"
�[2mJun 12 20:17:23.604�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Verifying signature with message: "post /v1/verifier/try_lock"
�[2mJun 12 20:17:23.769�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading Aleo address: "aleo1u6ammp4ramtxmgzkf33py0y5x7l3ezmws4avc9hkhftg32kwm5zqr7hp7s"
�[2mJun 12 20:17:23.770�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Reading signature: "98f1f41719e8e9fce8cfaa46654ba1ddd249a3903967acf131ed6de6194185021cf1c5b35c3ef3d8909c108068f8b852059121eb0c6b0d6be93ab95331b29304"
�[2mJun 12 20:17:23.770�[0m �[34mDEBUG�[0m aleo_setup_coordinator::authentication::aleo: Verifying signature with message: "post /v1/queue/verifier/join"

[apruden2008]

Yeah, I think this is a good feature to have. Perhaps the criteria for restarting the round can be defined in the coordinator config file? What do you think @ibaryshnikov ?

[kellpossible]

This can use the implementation of #286