functest: Fix ip link command output

[SchSeba]

This will fix the issue we sometime see <string>: Dump was interrupted and may be inconsistent.\n

https://docs.kernel.org/userspace-api/netlink/intro.html#dump-consistency

[github-actions]

Thanks for your PR,
To run vendors CIs, Maintainers can use one of:

• /test-all: To run all tests for all vendors.
• /test-e2e-all: To run all E2E tests for all vendors.
• /test-e2e-nvidia-all: To run all E2E tests for NVIDIA vendor.

To skip the vendors CIs, Maintainers can use one of:

• /skip-all: To skip all tests for all vendors.
• /skip-e2e-all: To skip all E2E tests for all vendors.
• /skip-e2e-nvidia-all: To skip all E2E tests for NVIDIA vendor.
  Best regards.

[coveralls]

Pull Request Test Coverage Report for Build 12482647928

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage remained the same at 47.225%

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Files with Coverage Reduction	New Missed Lines	%
controllers/drain_controller_helper.go	4	62.14%
controllers/generic_network_controller.go	5	74.38%

Totals
Change from base Build 12432456295:	0.0%
Covered Lines:	7198
Relevant Lines:	15242

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💛 - Coveralls

[zeeke]

LGTM