Backport maxprocs (#969)

[mattcary]

Backport #969, which fixes memory issues (See #968).
/kind bug

Backport of memory usage fix #969 for #968 (by setting go maxprocs to 1)

/assign @amacaskill

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattcary

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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	Required	Rerun command
pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration	4ba1ad7	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration

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[leiyiz]

/retest

[leiyiz]

/lgtm

[mattcary]

The integration tests are failing due to the ginkgo v1 / kubetest2 issue. I'll force-merge and we can test in gke internal.