Discovery patch (#2382)

* Upgrade libp2p and unstable gossip

* Network protocol upgrades

* Correct dependencies, reduce incoming bucket limit

* Clean up dirty DHT entries before repopulating

* Update cargo lock

* Update lockfile

* Update ENR dep

* Update deps to specific versions

* Update test dependencies

* Update docker rust, and remote signer tests

* More remote signer test fixes

* Temp commit

* Update discovery

* Remove cached enrs after dialing

* Increase the session capacity, for improved efficiency

beacon_node/eth2_libp2p/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Sigma Prime <[email protected]>"]
 edition = "2018"
 
 [dependencies]
-discv5 = { version = "0.1.0-beta.4", features = ["libp2p"] }
+discv5 = { version = "0.1.0-beta.5", features = ["libp2p"] }
 unsigned-varint = { version = "0.6.0", features = ["codec"] }
 types = { path =  "../../consensus/types" }
 hashset_delay = { path = "../../common/hashset_delay" }