message: [consensus] Remove future_lock dependency
  We no longer use it after simplifying concurrency in event_processor
  Hopefully we not going to need it in future as well.
diff: @@ -11,7 +11,6 @@ byteorder = "1.3.2"
  bytes = "0.4.12"
  grpcio = "0.4.3"
  futures = { version = "=0.3.0-alpha.17", package = "futures-preview", features = ["io-compat", "compat"] }
  -futures_locks = { version = "=0.3.0", package = "futures-locks", features=["tokio"]}
  mirai-annotations = "1.3.1"
  num-traits = "0.2"
  num-derive = "0.2"
  