Update cni spec to 0.4.0 (for net plugins allowing it) available since cni plugins 0.8.0

[floryut]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Update cni spec for network plugin that allow it

Which issue(s) this PR fixes:
None

Special notes for your reviewer:
CNI plugin spec matrix :

• macvlan is bundle with cni plugins 0.8.5 and support spec 0.4.0
• Multus support 0.4.0
• Cilum don't support 0.4.0, only 0.3.1
• Calico/Flannel (and Canal) don't support 0.4.0, only 0.3.1
• Contiv only support 0.3.1
• Weave doesn't support 0.4.0 nor 0.3.1, only 0.3.0
• Looks like kube-router only support 0.3.0

Also fix networking test error (if debug where executing on other instance than [0])

task path: /builds/kargo-ci/kubernetes-sigs-kubespray/tests/testcases/040_check-network-adv.yml:63
Sunday 03 May 2020 05:41:44 +0000 (0:00:00.073) 0:00:19.640 ************
ok: [instance-3] => {
"failed_when_result": false,
"nca_pod.stdout_lines": "VARIABLE IS NOT DEFINED!: 'dict object' has no attribute 'stdout_lines'"
}

Does this PR introduce a user-facing change?:

NONE

[EppO]

/lgtm

[EppO]

Weird, CNI spec 0.4.0 was released a year ago and very few CNI plugins support it.

[floryut]

Weird, CNI spec 0.4.0 was released a year ago and very few CNI plugins support it.

Yes I was hopeful before testing the matrix but in fact it's not that widespread at all :/

[Miouge1]

/approve

[k8s-ci-robot]

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This pull-request has been approved by: floryut, Miouge1

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