Don't add dhcp rules for multiasic testbed

[ZhaohuiS]

Signed-off-by: Zhaohui Sun zhaohuisun@microsoft.com

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

Approach

What is the motivation for this PR?

test_multiasic_cacl_application failed at adding dhcp rules in generate_expected_rules.

How did you do it?

Add a check, if it's multiasic, will not call iptables_rules.extend(expected_dhcp_rules_for_standby).

How did you verify/test it?

run cacl/test_cacl_application.py::test_multiasic_cacl_application

cacl/test_cacl_application.py::test_multiasic_cacl_application[0] PASSED                                                                                                                                       [ 44%]
cacl/test_cacl_application.py::test_multiasic_cacl_application[1] PASSED                                                                                                                                       [ 55%]
cacl/test_cacl_application.py::test_multiasic_cacl_application[2] PASSED                                                                                                                                       [ 66%]
cacl/test_cacl_application.py::test_multiasic_cacl_application[3] PASSED

Any platform specific information?

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

Documentation

[ZhaohuiS]

The issue was fixed in this PR #6170.
Close this one.