Description
The test failed even after the #9766 is merged

Steps to reproduce the issue:

1. Run the sflow test testDelAgent

Describe the results you received:
{"changed": true, "cmd": "//env-python3/bin/ptf --test-dir ptftests/py3 sflow_test --platform-dir ptftests --platform remote -t 'testbed_type='"'"'t0'"'"';router_mac='"'"'9c:05:91:9b:56:00'"'"';dst_port=3;agent_id='"'"'10.245.20.41'"'"';sflow_ports_file='"'"'/tmp/sflow_ports.json'"'"';polling_int=20;active_collectors="['"'"'collector0'"'"','"'"'collector1'"'"']"' --relax --debug info --log-file /tmp/TestAgentId.testDelAgent.log --socket-recv-size 16384", "delta": "0:00:30.819610", "end": "2023-10-10 23:56:54.898380", "failed": true, "msg": "non-zero return code", "rc": 1, "start": "2023-10-10 23:56:24.078770", "stderr": "//env-python3/bin/ptf:19: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses\n import imp\nsflow_test.SflowTest ... FAIL\n\n======================================================================\nFAIL: sflow_test.SflowTest\n----------------------------------------------------------------------\nTraceback (most recent call last):\n File "ptftests/py3/sflow_test.py", line 310, in runTest\n 'collector0', self.poll_tests)\n File "ptftests/py3/sflow_test.py", line 189, in packet_analyzer\n data, collector, self.polling_int, port_sample)\n File "ptftests/py3/sflow_test.py", line 211, in analyze_counter_sample\n % (self.agent_id, rcvd_agent_id))\nAssertionError: False is not true : Agent id in Sampled packet is not expected . Expected : 10.245.20.41 , received : 20.1.1.1\n\n----------------------------------------------------------------------\nRan 1 test in 29.349s\n\nFAILED (failures=1)", "stderr_lines": ["//env-python3/bin/ptf:19: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses", " import imp", "sflow_test.SflowTest ... FAIL", "", "======================================================================", "FAIL: sflow_test.SflowTest", "----------------------------------------------------------------------", "Traceback (most recent call last):", " File "ptftests/py3/sflow_test.py", line 310, in runTest", " 'collector0', self.poll_tests)", " File "ptftests/py3/sflow_test.py", line 189, in packet_analyzer", " data, collector, self.polling_int, port_sample)", " File "ptftests/py3/sflow_test.py", line 211, in analyze_counter_sample", " % (self.agent_id, rcvd_agent_id))", "AssertionError: False is not true : Agent id in Sampled packet is not expected . Expected : 10.245.20.41 , received : 20.1.1.1", "", "----------------------------------------------------------------------", "Ran 1 test in 29.349s", "", "FAILED (failures=1)"], "stdout": "Using packet manipulation module: ptf.packet_scapy\n\n*************************************\nATTENTION: SOME TESTS DID NOT PASS!!!\n\nThe following tests failed:\nSflowTest\n\n******************************************", "stdout_lines": ["Using packet manipulation module: ptf.packet_scapy", "", "", "ATTENTION: SOME TESTS DID NOT PASS!!!", "", "The following tests failed:", "SflowTest", "", ""]}

Describe the results you expected:

Additional information you deem important:

**Output of `show version`:**

```

202305_RC.7-c8447efe1_Internal
```

**Attach debug file `sudo generate_dump`:**

```
(paste your output here)
```