Port ip-echo-server to tokio 0.3

net-utils/Cargo.toml

@@ -10,7 +10,6 @@ edition = "2018"
 
 [dependencies]
 bincode = "1.3.1"
-bytes = "0.4"
 clap = "2.33.1"
 log = "0.4.11"
 nix = "0.19.0"
@@ -21,7 +20,7 @@ socket2 = "0.3.17"
 solana-clap-utils = { path = "../clap-utils", version = "1.6.0" }
 solana-logger = { path = "../logger", version = "1.6.0" }
 solana-version = { path = "../version", version = "1.6.0" }
-tokio = "0.1"
+tokio = { version = "0.3", features = ["full"] }
 url = "2.1.1"
 
 [lib]