Remove --kube-root deprecated kind argument

[stmcginnis]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

The --kube-root flag has been deprecated in kind for some time and will be removed. The current equivalent functionality is to pass the path to the kubernetes source as the first non-flag argument to build node-image.

This updates the prow script to use the newer preferred method in preparation for kind dropping the flag.

Which issue(s) this PR fixes:

Related: kubernetes-sigs/kind#3717

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @stmcginnis. Thanks for your PR.

I'm waiting for a kubernetes-csi member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[andyzhangx]

/ok-to-test

[stmcginnis]

Test failures do not look related:

ERROR: go module files *not* up-to-date, they did get modified by 'GO111MODULE=on go mod tidy':
diff --git a/go.mod b/go.mod
[snip]
diff --git a/go.sum b/go.sum
[snip]

Looks like maybe a side effect of an updated test runner environment?

[BenTheElder]

/cc @pohly @msau42

[BenTheElder]

/retest

[k8s-ci-robot]

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

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-csi-release-tools-csi-test	4e6fc3d	link	false	/test pull-kubernetes-csi-release-tools-csi-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[TerryHowe]

/lgtm

[k8s-ci-robot]

@TerryHowe: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: stmcginnis, TerryHowe
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[BenTheElder]

nudge @pohly

[xing-yang]

Looks like CI didn't pass.

[stmcginnis]

CI for this repo appears to be broken for awhile now. #259 (comment)

[TerryHowe]

This kubernetes-csi/csi-test#560 may resolve the broken tests