test: Add missing wait for version to be sent in add_outbound_p2p_connection

test/functional/test_framework/test_node.py

@@ -703,6 +703,7 @@ class TestNode():
             p2p_conn.wait_for_connect()
             self.p2ps.append(p2p_conn)
 
+            p2p_conn.wait_until(lambda: not p2p_conn.on_connection_send_msg)
             if wait_for_verack:
                 p2p_conn.wait_for_verack()
                 p2p_conn.sync_with_ping()