asio: fix asio test code to start the test after ip address received from common example code

Previously set to wait until IP address got from tcpip_adapter, but since common example connect code blocks until both IP4 and IPv6 address received it could happen that test code might have started connection to the ASIO counter-part while ESP32 still waiting for IPv6 address


* Original commit: espressif/esp-idf@208feef3c9

examples/protocols/asio/chat_server/asio_chat_server_test.py

@@ -37,7 +37,7 @@ def test_examples_protocol_asio_chat_server(env, extra_data):
     # 1. start test
     dut1.start_app()
     # 2. get the server IP address
-    data = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
+    data = dut1.expect(re.compile(r" IPv4 address: ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)"), timeout=30)
     # 3. create tcp client and connect to server
     cli = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     cli.settimeout(30)