[Cherry Pick] 202012 Fix dual-tor dhcpv6 relay test cases failure #9960
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Summary:
Cherry pick (#9842) to 202012
Type of change
Back port request
Approach
What is the motivation for this PR?
Cherry pick (#9842) to 202012
Code gap is big, solution refined based on 202012 base code.
How did you do it?
How did you verify/test it?
dhcp_relay/test_dhcpv6_relay.py::test_dhcp_relay_default
dhcp_relay/test_dhcpv6_relay.py::test_dhcpv6_relay_counter
Any platform specific information?
Supported testbed topology if it's a new test case?
Documentation