Make connection setup in protocol_handlers test more deterministic

tests/p2p/test_protocol_handlers.nim

@@ -56,16 +56,13 @@ suite "Testing protocol handlers":
     let bootENode = await setupBootNode()
     var node1 = setupTestNode(abc, xyz)
     var node2 = setupTestNode(abc, xyz)
-    # node2 listening and node1 not, to avoid many incoming vs outgoing
-    var node1Connected = node1.connectToNetwork(@[bootENode], false, true)
-    var node2Connected = node2.connectToNetwork(@[bootENode], true, true)
-    await node1Connected
-    await node2Connected
-    check:
-      node1.peerPool.connectedNodes.len() == 1
-      node2.peerPool.connectedNodes.len() == 1
 
-    for peer in node1.peers():
+    node2.startListening()
+    let peer = await node1.rlpxConnect(newNode(initENode(node2.keys.pubKey,
+                                                         node2.address)))
+    check:
+      peer.isNil == false
+
     await peer.disconnect(SubprotocolReason, true)
     check:
       # we want to check that even though the exceptions in the disconnect