dhcpv6 per-interface counter automation script coverage

[jcaiMR]

Description of PR

DHCPv6 per interface counter automation script coverage

Summary:
Fixes # (issue)

Type of change

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

Back port request

• 201911
• 202012
• 202205

Approach

What is the motivation for this PR?

1. Cover basic function of DHCPv6 per interface counter.
2. Script support both old counter STATE_DB format and new format.

Old STATE_DB format

sonic-db-cli STATE_DB hgetall 'DHCPv6_COUNTER_TABLE|Vlan1000'
{'Unknown':'0','Solicit':'0','Advertise':'0','Request':'0','Confirm':'0','Renew':'0','Rebind':'0','Reply':'0','Release':'0','Decline':'0','Reconfigure':'0','Information-Request':'0','Relay-Forward':'0','Relay-Reply':'0','Malformed':'0'}

New STATE_DB format

sonic-db-cli STATE_DB hgetall 'DHCPv6_COUNTER_TABLE|Vlan1000'
{'TX': "{'Unknown':'0','Solicit':'0','Advertise':'0','Request':'0','Confirm':'0','Renew':'0','Rebind':'0','Reply':'0','Release':'0','Decline':'0','Reconfigure':'0','Information-Request':'0','Relay-Forward':'0','Relay-Reply':'0','Malformed':'0'}",
'RX': "{'Unknown':'0','Solicit':'0','Advertise':'0','Request':'0','Confirm':'0','Renew':'0','Rebind':'0','Reply':'0','Release':'0','Decline':'0','Reconfigure':'0','Information-Request':'0','Relay-Forward':'0','Relay-Reply':'0','Malformed':'0'}"}

How did you do it?

How did you verify/test it?

dhcp_relay/test_dhcpv6_relay.py::test_dhcpv6_relay_counter

Run script with both old image and new image, on dual tor and single tor

Any platform specific information?

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

Documentation

[mssonicbld]

The pre-commit check detected issues in the files touched by this pull request.
The pre-commit check is a mandatory check, please fix detected issues.

Detailed pre-commit check results:
trim trailing whitespace.................................................Failed
- hook id: trailing-whitespace
- exit code: 1
- files were modified by this hook

Fixing tests/dhcp_relay/test_dhcpv6_relay.py

fix end of files.........................................................Passed
check yaml...........................................(no files to check)Skipped
check for added large files..............................................Passed
check python ast.........................................................Passed
flake8...................................................................Failed
- hook id: flake8
- exit code: 1

tests/dhcp_relay/test_dhcpv6_relay.py:27:121: E501 line too long (132 > 120 characters)
tests/dhcp_relay/test_dhcpv6_relay.py:39:1: E302 expected 2 blank lines, found 1
tests/dhcp_relay/test_dhcpv6_relay.py:42:121: E501 line too long (124 > 120 characters)
tests/dhcp_relay/test_dhcpv6_relay.py:44:121: E501 line too long (124 > 120 characters)
tests/dhcp_relay/test_dhcpv6_relay.py:65:1: E302 expected 2 blank lines, found 1
...
[truncated extra lines, please run pre-commit locally to view full check results]

To run the pre-commit checks locally, you can follow below steps:

1. Ensure that default python is python3. In sonic-mgmt docker container, default python is python2. You can run
   the check by activating the python3 virtual environment in sonic-mgmt docker container or outside of sonic-mgmt
   docker container.
2. Ensure that the pre-commit package is installed:

sudo pip install pre-commit

3. Go to repository root folder
4. Install the pre-commit hooks:

pre-commit install

5. Use pre-commit to check staged file:

pre-commit

6. Alternatively, you can check committed files using:

pre-commit run --from-ref <commit_id> --to-ref <commit_id>

[mssonicbld]

The pre-commit check detected issues in the files touched by this pull request.
The pre-commit check is a mandatory check, please fix detected issues.

Detailed pre-commit check results:
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...........................................(no files to check)Skipped
check for added large files..............................................Passed
check python ast.........................................................Passed
flake8...................................................................Failed
- hook id: flake8
- exit code: 1

tests/dhcp_relay/test_dhcpv6_relay.py:278:121: E501 line too long (121 > 120 characters)

flake8...............................................(no files to check)Skipped
check conditional mark sort..........................(no files to check)Skipped

To run the pre-commit checks locally, you can follow below steps:

1. Ensure that default python is python3. In sonic-mgmt docker container, default python is python2. You can run
   the check by activating the python3 virtual environment in sonic-mgmt docker container or outside of sonic-mgmt
   docker container.
2. Ensure that the pre-commit package is installed:

sudo pip install pre-commit

3. Go to repository root folder
4. Install the pre-commit hooks:

pre-commit install

5. Use pre-commit to check staged file:

pre-commit

6. Alternatively, you can check committed files using:

pre-commit run --from-ref <commit_id> --to-ref <commit_id>

[mssonicbld]

Cherry-pick PR to 202305: #10412