sonic-mgmt test cases for express-reboot

[jhli-cisco]

Description of PR

New set of test cases to test express boot feature. It covers the same scenario as in test_advanced_reboot for warm-reboot.

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?

Test cases for express boot feature

How did you do it?

Create a new set of test cases

How did you verify/test it?

Run through it using an image that supports express boot

Any platform specific information?

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

t0

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.................................................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

ansible/roles/test/files/ptftests/py3/advanced-reboot.py:22:121: E501 line too long (122 > 120 characters)
ansible/roles/test/files/ptftests/py3/advanced-reboot.py:1356:121: E501 line too long (126 > 120 characters)
ansible/roles/test/files/ptftests/py3/advanced-reboot.py:1372:121: E501 line too long (126 > 120 characters)
tests/common/fixtures/ptfhost_utils.py:341:121: E501 line too long (145 > 120 characters)
tests/platform_tests/test_express_reboot.py:60:1: E266 too many leading '#' for block comment

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>