Switch libp2p sigp gossipsub fork (#4999)

* switch libp2p source to sigp fork

* Shift the connection closing inside RPC behaviour

* Tag specific commits

* Add slow peer scoring

* Fix test

* Use default yamux config

* Pin discv5 to our libp2p fork and cargo update

* Upgrade libp2p to enable yamux gains

* Add a comment specifying the branch being used

* cleanup build output from within container
(prevents CI warnings related to fs permissions)

* Remove revision tags add branches for testing, will revert back once we're happy

* Update to latest rust-libp2p version

* Pin forks

* Update cargo.lock

* Re-pin to panic-free rust

---------

Co-authored-by: Age Manning <Age@AgeManning.com>
Co-authored-by: Pawan Dhananjay <pawandhananjay@gmail.com>
Co-authored-by: antondlr <anton@delaruelle.net>
Co-authored-by: Michael Sproul <michael@sigmaprime.io>

Cargo.toml

@@ -105,7 +105,7 @@ criterion = "0.3"
 delay_map = "0.3"
 derivative = "2"
 dirs = "3"
-discv5 = { version = "0.3", features = ["libp2p"] }
+discv5 = { git="https://github.com/sigp/discv5", rev="dbb4a718cd32eaed8127c3c8241bfd0fde9eb908", features = ["libp2p"] }
 env_logger = "0.9"
 error-chain = "0.12"
 ethereum-types = "0.14"
@@ -149,7 +149,7 @@ slog = { version = "2", features = ["max_level_trace", "release_max_level_trace"
 slog-async = "2"
 slog-term = "2"
 sloggers = { version = "2", features = ["json"] }
-smallvec = "1"
+smallvec = "1.11.2"
 snap = "1"
 ssz_types = "0.5"
 strum = { version = "0.24", features = ["derive"] }