message: [network] remove real_blackbox feature
  This is blocking stable Rust. The black_box function is never used so this has no effect.
diff: @@ -33,7 +33,7 @@ socket_bench_server = { path = "socket_bench_server" }
  types = { path = "../types" }
  [dev-dependencies]
  -criterion = { version = "0.2.11", features = ["real_blackbox"] }
  +criterion = "0.2.11"
  [dev-dependencies.nextgen_crypto]
  features = ["testing"]
  