Update discv5 and remove discovery retries (#1373)

Cargo.lock

@@ -1209,9 +1209,9 @@ checksum = "212d0f5754cb6769937f4501cc0e67f4f4483c8d2c3e1e922ee9edbe4ab4c7c0"
 
 [[package]]
 name = "discv5"
-version = "0.1.0-alpha.6"
+version = "0.1.0-alpha.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d98b6912fcca9a6491fc1addcd4d205323005d922d65cb67bfed8748bc8a89b6"
+checksum = "d7083584562c5b36f929dbe621437a911eef4f8ac73bab1b1c64c8f556212943"
 dependencies = [
  "arrayvec",
  "digest 0.8.1",
@@ -1228,7 +1228,7 @@ dependencies = [
  "multihash",
  "net2",
  "openssl",
- "parking_lot 0.10.2",
+ "parking_lot 0.11.0",
  "rand 0.7.3",
  "rlp",
  "sha2 0.8.2",

beacon_node/eth2_libp2p/Cargo.toml

@@ -32,7 +32,7 @@ snap = "1.0.0"
 void = "1.0.2"
 tokio-io-timeout = "0.4.0"
 tokio-util = { version = "0.3.1", features = ["codec", "compat"] }
-discv5 = { version = "0.1.0-alpha.6", features = ["libp2p"] }
+discv5 = { version = "0.1.0-alpha.7", features = ["libp2p"] }
 tiny-keccak = "2.0.2"
 environment = { path = "../../lighthouse/environment" }
 

beacon_node/eth2_libp2p/src/config.rs

@@ -104,8 +104,8 @@ impl Default for Config {
             .enable_packet_filter()
             .session_cache_capacity(1000)
             .request_timeout(Duration::from_secs(4))
-            .request_retries(2)
-            .enr_peer_update_min(2) // prevents NAT's should be raised for mainnet
+            .request_retries(1)
+            .enr_peer_update_min(10)
             .query_parallelism(5)
             .query_timeout(Duration::from_secs(30))
             .query_peer_timeout(Duration::from_secs(2))

lighthouse/environment/Cargo.toml

@@ -21,4 +21,4 @@ slog-json = "2.3.0"
 exit-future = "0.2.0"
 lazy_static = "1.4.0"
 lighthouse_metrics = { path = "../../common/lighthouse_metrics" }
-discv5 = "0.1.0-alpha.6"
+discv5 = "0.1.0-alpha.7"