[action] [PR:18828] [dualtor-io] Fix duplication merge condition

[mssonicbld]

Description of PR

Summary:
Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• New Test case
• Skipped for non-supported platforms
• Test case improvement

Back port request

• 202205
• 202305
• 202311
• 202405
• 202411
• 202505

Approach

What is the motivation for this PR?

Work Item: 33161844

Fix the dualtor_io.test_link_failure.test_active_link_down_downstream_active_soc[active-active] failure:

Failed: 
Traffic to server 192.168.0.15 was disrupted 2 times. Allowed number of disruptions: 1

The server 192.168.0.15 I/O result shows that there are two disruptions:

01/06/2025 15:06:12 dual_tor_io.examine_flow L0740 INFO | Server 192.168.0.15 results:
{
 "sent_packets": 652,
 "received_packets": 650,
 "disruption_before_traffic": false,
 "disruption_after_traffic": false,
 "duplications": [],
 "disruptions": [
 {
 "start_time": 1748790187.24364,
 "end_time": 1748790187.772263,
 "start_id": 70,
 "end_id": 72
 },
 {
 "start_time": 1748790187.772263,
 "end_time": 1748790188.304254,
 "start_id": 72,
 "end_id": 74
 }
 ]
}

Actually, there is only one disruption, but due to the vlan flooding behavior, packet with id 70 is flooded in the vlan and received; so two disruptions are detected.
So for this case, the following two disruptions should be merged into one.

Signed-off-by: Longxiang Lyu [email protected]

How did you do it?

Change the merge condition to allow merge in this case.

How did you verify/test it?

Run on Cisco dualtor testbed and pass.

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[mssonicbld]

Original PR: #18828

[mssonicbld]

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