.gitignore updates

[dprince]

Add config/operator/deployment/kustomization.yaml and remove some unused entries

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprince

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[openshift-ci]

@dprince: 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
ci/prow/openstack-operator-build-deploy-kuttl	1f62bab	link	true	/test openstack-operator-build-deploy-kuttl

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