asio: added socket timeout for example tests

* Original commit: espressif/esp-idf@c0186858ad

examples/protocols/asio/tcp_echo_server/asio_tcp_server_test.py

@@ -41,6 +41,7 @@ def test_examples_protocol_asio_tcp_server(env, extra_data):
     data = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
     # 3. create tcp client and connect to server
     cli = socket(AF_INET,SOCK_STREAM)
+    cli.settimeout(30)
     cli.connect((data[0],80))
     cli.send(test_msg)
     data = cli.recv(1024)