Remove stackdriver version variable

[lizhuqi]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

$STACKDRIVER_VERSION is no longer used so we shall remove it now.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

@lizhuqi: This issue is currently awaiting triage.

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[k8s-ci-robot]

Hi @lizhuqi. Thanks for your PR.

I'm waiting for a kubernetes 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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[ping035627]

/ok-to-test

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/lifecycle stale

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ibabou, lizhuqi

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• cluster/gce/windows/OWNERS [ibabou]

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[ibabou]

/lgtm