runbook/KubemacpoolMACCollisionDetected: Add Pod diagnosis step

[RamLavi]

What this PR does / why we need it:
KubeMacPool now detects MAC collisions on Pods with Multus secondary interfaces (in addition to VMIs) k8snetworkplumbingwg/kubemacpool#612.

This PR adds a diagnosis step showing how to find colliding Pods by querying the network-status annotation.

Also refactor step 3 to use MAC env var.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist

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• Design: A design document was considered and is present (link) or not required
• PR: The PR description is expressive enough and will help future contributors
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• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
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Release note:

Add pod collision support

[RamLavi]

/hold

until k8snetworkplumbingwg/kubemacpool#612 is merged

[RamLavi]

example:

[root@zeus33 kubemacpool]# export MAC=02:00:00:11:22:33
[root@zeus33 kubemacpool]# kubectl get vmi -A -o jsonpath='{range .items[*]}{.metadata.namespace}{"\t"}{.metadata.name}{"\t"}{.status.interfaces[*].mac}{"\n"}{end}' | grep -i "$MAC"
test-collision-ns1	cross-vm-1	02:00:00:11:22:33
test-collision-ns1	cross-vm-2	02:00:00:11:22:33
test-collision-ns2	cross-vm-3	02:00:00:11:22:33
[root@zeus33 kubemacpool]# kubectl get pod -A -o json | jq -r --arg mac "$MAC" '.items[] | .metadata as $m | (.metadata.annotations["k8s.v1.cni.cncf.io/network-status"] // "[]" | fromjson)[] | select(.mac // "" | test($mac; "i")) | "\($m.namespace)\t\($m.name)\t\(.mac)"'
test-collision-ns1	cross-pod-1	02:00:00:11:22:33
test-collision-ns1	cross-pod-2	02:00:00:11:22:33
test-collision-ns2	cross-pod-3	02:00:00:11:22:33
test-collision-ns2	cross-pod-4	02:00:00:11:22:33

[RamLavi]

@avlitman can you take a look?