[Test Gap][IPinIP hash][T0 and Dualtor]Need test case to verify the hash behavior of IPinIP traffic on T0

[bingwang-ms]

Test Gap Description

There is test gap in verifying the hash behavior of IPinIP traffic on T0,
We already have a test case to verify that on T1

sonic-mgmt/tests/fib/test_fib.py

Line 526 in 35f5d8b

def test_ipinip_hash(add_default_route_to_dut, duthost, duthosts, # noqa F811

But the test gap still exists on T0, particularly dualtor standby side.

Test Plan

No response

Test environment

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Attach files (if any)

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