Fix kubectl parsing

[mattcary]

/kind bug
/assign @saikat-royc

What this PR does / why we need it:
kubectl output has changed and our version parsing needs to be updated.

None

[saikat-royc]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattcary, saikat-royc

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[k8s-ci-robot]

@mattcary: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Rerun command
pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration	e7e1cae	link	/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration

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[mattcary]

Just the multivolume flake. Hopefully we'll get to this in our fixit in August!