Problem: concurrency issues on the orchestrator

[thomas-nguy]

We see those kind of errors appearing time to time

Sep 16 04:15:30 ip-10-202-4-71 gorc[518560]: 2022-09-16T04:15:30.831055Z ERROR cosmos_gravity::send: Error during gRPC call to Cosmos containing 5 messages of types {"/gravity.v1.MsgSubmitEthereumEvent"}: CosmosGrpcError(RequestError { error: Status { code: Unknown, message: "failed to execute message; message index: 0: create event vote record: non contiguous event nonce expected 11353 observed 14000 for validator 67B43F72BC20E39736D03E01BE3BD8ED7F993307: invalid", metadata: MetadataMap { headers: {"content-type": "application/grpc", "x-cosmos-block-height": "1359041"} } } })

Maybe the msg are not correctly sorted when sending to cosmos

[thomas-nguy]

partially fixed with #125

longer term solution (PeggyJV#456)