Remove passwd- file to make CIS benchmark happy

[mattcary]

/kind bug

In order to pass the CIS benchmark, the /etc/passwd- file can only be root-readable. Even better is to just remove it altogether, as the PR does.

Pass [CIS benchmark](https://www.cisecurity.org/cis-benchmarks/) by cleaning up /etc/passwd- in the driver image.

/assign @amacaskill

[k8s-ci-robot]

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[mattcary]

Could the failure be due to PSP deprecation?

W0716 01:03:47.514] resource mapping not found for name: "csi-gce-pd-controller-psp" namespace: "" from "STDIN": no matches for kind "PodSecurityPolicy" in version "policy/v1beta1"
W0716 01:03:47.514] ensure CRDs are installed first
W0716 01:03:47.514] resource mapping not found for name: "csi-gce-pd-node-psp" namespace: "" from "STDIN": no matches for kind "PodSecurityPolicy" in version "policy/v1beta1"
W0716 01:03:47.514] ensure CRDs are installed first
W0716 01:03:47.515] resource mapping not found for name: "csi-gce-pd-node-psp-win" namespace: "" from "STDIN": no matches for kind "PodSecurityPolicy" in version "policy/v1beta1"
W0716 01:03:47.515] ensure CRDs are installed first
W0716 01:03:47.516] E0716 01:03:47.515793    8031 main.go:398] failed to delete driver: failed to delete driver: exit status 1

[mattcary]

I think it is, I'm trying to pin the tests for this branch to 1.21 to see if that allows us to test.

[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	7694652	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration

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[mattcary]

Sigh, it's failing now because hack/ginkgo-e2e.sh in release-1.21 has outdated flags. I'll have to force-push this and we'll run through the internal GKE tests.