add ipv6_mgmt sanity check for debugging

[sdszhang]

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Description of PR

Summary: Add debug info for ADO 28489716

Type of change

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

Back port request

• [ ] 202012
• [ ] 202205
• [x] 202305
• [x] 202311
• [x] 202405

Approach

What is the motivation for this PR?

To check the ipv6_mgmt_only failures failed on setup with "Failed: str3-8102-01 doesn't have available IPv6 Management IP address" in nightly test.

How did you do it?

Add additional debugs before each test run, and check the ipv6 reachability issue.

How did you verify/test it?

Verified reachable, unreachable and attribute scenarios.

Any platform specific information?

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

Documentation

[sdszhang]

Unit test result for failed output.

04/07/2024 05:31:27 parallel.parallel_run                    L0153 DEBUG  | Started process 27020 running target "_check_ipv6_mgmt_to_dut--<MultiAsicSonicHost vlab-01>"
04/07/2024 05:31:27 checks._check_ipv6_mgmt_to_dut           L1002 INFO   | Checking ipv6 mgmt interface reachability on vlab-01...
04/07/2024 05:31:38 checks._check_ipv6_mgmt_to_dut           L1012 INFO   | Failed to ping ipv6 mgmt interface on vlab-01, exception: CalledProcessError(1, ['ping6', '-c', '2', '2001::8'])
04/07/2024 05:31:38 checks._check_ipv6_mgmt_to_dut           L1013 INFO   | Ping6 output: PING 2001::8(2001::8) 56 data bytes

--- 2001::8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1032ms


04/07/2024 05:31:38 checks._check_ipv6_mgmt_to_dut           L1017 INFO   | Done checking ipv6 management reachability on vlab-01
04/07/2024 05:31:38 parallel.on_terminate                    L0085 INFO   | process _check_ipv6_mgmt_to_dut--<MultiAsicSonicHost vlab-01> terminated with exit code None
04/07/2024 05:31:38 parallel.parallel_run                    L0161 DEBUG  | task completed 1, running 0
04/07/2024 05:31:38 parallel.parallel_run                    L0221 INFO   | Completed running processes for target "_check_ipv6_mgmt_to_dut" in 0:00:11.047571 seconds
04/07/2024 05:31:38 __init__.do_checks                       L0114 DEBUG  | check results of each item [{'failed': False, 'check_item': 'ipv6_mgmt', 'host': 'vlab-01'}] 

Unit test for passed output:

04/07/2024 05:23:43 parallel.parallel_run                    L0153 DEBUG  | Started process 24234 running target "_check_ipv6_mgmt_to_dut--<MultiAsicSonicHost vlab-01>"
04/07/2024 05:23:43 checks._check_ipv6_mgmt_to_dut           L1002 INFO   | Checking ipv6 mgmt interface reachability on vlab-01...
04/07/2024 05:23:44 checks._check_ipv6_mgmt_to_dut           L1008 INFO   | Ping6 output: PING fec0::ffff:afa:1(fec0::ffff:afa:1) 56 data bytes
64 bytes from fec0::ffff:afa:1: icmp_seq=1 ttl=63 time=0.436 ms
64 bytes from fec0::ffff:afa:1: icmp_seq=2 ttl=63 time=0.601 ms

--- fec0::ffff:afa:1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1005ms
rtt min/avg/max/mdev = 0.436/0.518/0.601/0.082 ms

04/07/2024 05:23:44 checks._check_ipv6_mgmt_to_dut           L1017 INFO   | Done checking ipv6 management reachability on vlab-01
04/07/2024 05:23:44 parallel.on_terminate                    L0085 INFO   | process _check_ipv6_mgmt_to_dut--<MultiAsicSonicHost vlab-01> terminated with exit code None
04/07/2024 05:23:44 parallel.parallel_run                    L0161 DEBUG  | task completed 1, running 0
04/07/2024 05:23:44 parallel.parallel_run                    L0221 INFO   | Completed running processes for target "_check_ipv6_mgmt_to_dut" in 0:00:01.020536 seconds
04/07/2024 05:23:44 __init__.do_checks                       L0114 DEBUG  | check results of each item [{'failed': False, 'check_item': 'ipv6_mgmt', 'host': 'vlab-01'}] 

[mssonicbld]

Cherry-pick PR to 202311: https://github.com/sonic-net/sonic-mgmt/pull/13657

[mssonicbld]

Cherry-pick PR to 202405: https://github.com/sonic-net/sonic-mgmt/pull/13658

[mssonicbld]

Cherry-pick PR to 202305: https://github.com/sonic-net/sonic-mgmt/pull/13659