Unban peers at the swarm level when purged (#2855)

## Issue Addressed
#2840

beacon_node/lighthouse_network/tests/common/mod.rs

@@ -13,6 +13,13 @@ use std::time::Duration;
 use tokio::runtime::Runtime;
 use types::{ChainSpec, EnrForkId, EthSpec, ForkContext, Hash256, MinimalEthSpec};
 
+#[allow(clippy::type_complexity)]
+#[allow(unused)]
+pub mod behaviour;
+#[allow(clippy::type_complexity)]
+#[allow(unused)]
+pub mod swarm;
+
 type E = MinimalEthSpec;
 use tempfile::Builder as TempBuilder;
 
@@ -41,6 +48,7 @@ impl std::ops::DerefMut for Libp2pInstance {
     }
 }
 
+#[allow(unused)]
 pub fn build_log(level: slog::Level, enabled: bool) -> slog::Logger {
     let decorator = slog_term::TermDecorator::new().build();
     let drain = slog_term::FullFormat::new(decorator).build().fuse();