MIGSMSFT-765 & MIGSMSFT-778 Fixed udp ports for different priorities

[zhixzhu]

Description of PR

Summary:
Fixes # (issue)
https://migsonic.atlassian.net/browse/MIGSMSFT-765
https://migsonic.atlassian.net/browse/MIGSMSFT-778

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405

Approach

What is the motivation for this PR?

Fixed udp ports selection, make test result stable.

How did you do it?

Remove random.

How did you verify/test it?

Verified it on T2 ixia testbed.

=============================================================== PASSES ================================================================
_________________________________________ test_m2o_fluctuating_lossless[multidut_port_info0] __________________________________________
----------------------- generated xml file: /run_logs/ixia/18470/2024-11-27-01-04-55/tr_2024-11-27-01-04-55.xml -----------------------
INFO:root:Can not get Allure report URL. Please check logs
------------------------------------------------------- live log sessionfinish --------------------------------------------------------
01:14:00 __init__.pytest_terminal_summary         L0067 INFO   | Can not get Allure report URL. Please check logs
======================================================= short test summary info =======================================================
PASSED snappi_tests/multidut/pfc/test_m2o_fluctuating_lossless.py::test_m2o_fluctuating_lossless[multidut_port_info0]
============================================== 1 passed, 4 warnings in 542.83s (0:09:02) ==============================================
sonic@snappi-sonic-mgmt-vanilla-202405-t2:/data/tests$ 

=============================================================== PASSES ================================================================
___________________________________________ test_pfcwd_runtime_traffic[multidut_port_info0] ___________________________________________
----------------------- generated xml file: /run_logs/ixia/18470/2024-11-27-01-19-10/tr_2024-11-27-01-19-10.xml -----------------------
INFO:root:Can not get Allure report URL. Please check logs
------------------------------------------------------- live log sessionfinish --------------------------------------------------------
01:28:10 __init__.pytest_terminal_summary         L0067 INFO   | Can not get Allure report URL. Please check logs
======================================================= short test summary info =======================================================
PASSED snappi_tests/multidut/pfcwd/test_multidut_pfcwd_runtime_traffic_with_snappi.py::test_pfcwd_runtime_traffic[multidut_port_info0]
============================================== 1 passed, 4 warnings in 538.55s (0:08:58) ==============================================
sonic@snappi-sonic-mgmt-vanilla-202405-t2:/data/tests$ 

Any platform specific information?

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

Documentation

[sdszhang]

1. can you use a global variable for the starting port 5000
2. I would prefer to remove the *1000 steps, just use 5000 + eth.pfc_queue.value. For two flows, port 5000 and 6000 may still hash to the same port, but 5000 and 5001 are unlikely to be hashed to same port in most platform.