hack: set_receipient earlier to avoid a race condition

It seems that we have a race-condition pre-existing on master:

```diff
diff --git a/tools/mock_node/src/setup.rs b/tools/mock_node/src/setup.rs
index 501722c07..0378cf0f9 100644
--- a/tools/mock_node/src/setup.rs
+++ b/tools/mock_node/src/setup.rs
@@ -342,6 +342,7 @@ pub fn setup_mock_node(
     #[cfg(feature = "test_features")]
     let server = None;

+    std::thread::sleep_ms(300);
     network_adapter.set_recipient(mock_network_actor.clone().recipient());
     (mock_network_actor, client_actor, view_client, server)
 }
```

and then

```
$ cargo test -p mock_node --lib -- test_mock_node_basic
```

fail for me.

THe current actix upgrade seems to exacebrate the issues, alegedly
because start_http now takes longer.

Work-around this by tying the know earlier.

nearcore/src/lib.rs

@@ -323,6 +323,7 @@ pub fn start_with_config_and_synchronization(
         )
         .unwrap()
     });
+    network_adapter.set_recipient(network_actor.recipient());
 
     #[cfg(feature = "json_rpc")]
     if let Some(rpc_config) = config.rpc_config {
@@ -351,8 +352,6 @@ pub fn start_with_config_and_synchronization(
         ));
     }
 
-    network_adapter.set_recipient(network_actor.recipient());
-
     rpc_servers.shrink_to_fit();
 
     trace!(target: "diagnostic", key="log", "Starting NEAR node with diagnostic activated");

tools/mock_node/src/setup.rs

@@ -327,6 +327,7 @@ pub fn setup_mock_node(
                 !archival,
             )
         });
+    network_adapter.set_recipient(mock_network_actor.clone().recipient());
 
     // for some reason, with "test_features", start_http requires PeerManagerActor,
     // we are not going to run start_mock_network with test_features, so let's disable that for now
@@ -342,7 +343,6 @@ pub fn setup_mock_node(
     #[cfg(feature = "test_features")]
     let server = None;
 
-    network_adapter.set_recipient(mock_network_actor.clone().recipient());
     (mock_network_actor, client_actor, view_client, server)
 }