Improve single-node testnet support and Arc NetworkConfig/ChainSpec (#6396)

* Arc ChainSpec and NetworkConfig

* Fix release tests

* Fix lint

* Merge remote-tracking branch 'origin/unstable' into single-node-testnet

beacon_node/network/src/service/tests.rs

@@ -73,6 +73,7 @@ mod tests {
         config.discv5_config.table_filter = |_| true; // Do not ignore local IPs
         config.upnp_enabled = false;
         config.boot_nodes_enr = enrs.clone();
+        let config = Arc::new(config);
         runtime.block_on(async move {
             // Create a new network service which implicitly gets dropped at the
             // end of the block.
@@ -86,7 +87,7 @@ mod tests {
 
             let _network_service = NetworkService::start(
                 beacon_chain.clone(),
-                &config,
+                config,
                 executor,
                 None,
                 beacon_processor_tx,
@@ -125,7 +126,7 @@ mod tests {
 
         // Build beacon chain.
         let beacon_chain = BeaconChainHarness::builder(MinimalEthSpec)
-            .spec(spec.clone())
+            .spec(spec.clone().into())
             .deterministic_keypairs(8)
             .fresh_ephemeral_store()
             .mock_execution_layer()
@@ -149,12 +150,13 @@ mod tests {
             config.set_ipv4_listening_address(std::net::Ipv4Addr::UNSPECIFIED, 21214, 21214, 21215);
             config.discv5_config.table_filter = |_| true; // Do not ignore local IPs
             config.upnp_enabled = false;
+            let config = Arc::new(config);
 
             let beacon_processor_channels =
                 BeaconProcessorChannels::new(&BeaconProcessorConfig::default());
             NetworkService::build(
                 beacon_chain.clone(),
-                &config,
+                config,
                 executor.clone(),
                 None,
                 beacon_processor_channels.beacon_processor_tx,