[config_facts] Add port list member to PORTCHANNEL

[lolyu]

Description of PR

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?

Fix KeyError when tests try to find member ports out of PORTCHANNEL in config_facts.
This is due to the removal of member array from PORTCHANNEL table:
sonic-net/sonic-buildimage#13660

How did you do it?

Add back the member ports array.

How did you verify/test it?

Run test_active_tor_shutdown_bgp_sessions_upstream over dualtor-mixed testbed.

Any platform specific information?

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

Documentation

[wangxin]

The pre-commit check detected issues in the files touched by this pull request.
The detected issues may be old or new. For new issues, please try to fix them.

For old issues, it is not mandatory to fix them because they were not caused by this change. It is unfair to blame
author of this pull request. But if you can take extra effort to fix the old issues as well, that would be great!

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

Fixing ansible/library/config_facts.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

ansible/library/config_facts.py:36:1: E302 expected 2 blank lines, found 1
ansible/library/config_facts.py:60:33: E225 missing whitespace around operator
ansible/library/config_facts.py:90:9: E303 too many blank lines (2)
ansible/library/config_facts.py:97:13: E265 block comment should start with '# '
ansible/library/config_facts.py:101:35: E201 whitespace after '{'
...
[truncated extra lines, please run pre-commit locally to view full check results]

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