Inconsistencies between different installation methods

I noticed some confusing inconsistencies when checking things under `deployments` folder and different installation methods...

GPU plugin is installed on different nodes depending on used method:
```
$ git grep feature.node.kubernetes.io | grep gpu
gpu_plugin/overlays/nfd_labeled_nodes/add-nodeselector-intel-gpu.yaml: feature.node.kubernetes.io/pci-0300_8086.present: "true"
nfd/overlays/node-feature-rules/node-feature-rules-openshift.yaml: "intel.feature.node.kubernetes.io/gpu": "true"
nfd/overlays/node-feature-rules/node-feature-rules.yaml: "intel.feature.node.kubernetes.io/gpu": "true"
operator/samples/deviceplugin_v1_gpudeviceplugin.yaml: intel.feature.node.kubernetes.io/gpu: "true"
```

IMHO at least the last two first options (relying on NFD), should be the same, not differ:
* With operator, GPU plugins are deployed to all nodes with Intel GPUs
* Using `gpu_plugin/overlays/nfd_labeled_nodes`, they go only to nodes with Intel GPUs supporting display output
* Following GPU plugin README, plugin is deployed on all nodes regardless of whether they have GPU

Whereas inconsistencies in namespace usage between installation methods could mean that user ends accidentally with multiple instances of the same thing running in different namespaces:
```
$ cd deployments; git grep namespace: | grep -v -e { -e "'" -e % -e _test
dsa_plugin/overlays/dsa_initcontainer/dsa-config.yaml: namespace: inteldeviceplugins-system
dsa_plugin/overlays/namespace_kube-system/add-namespace-kube-system.yaml: namespace: kube-system
fpga_admissionwebhook/base/manager_webhook_patch.yaml: namespace: system
fpga_admissionwebhook/certmanager/certificate.yaml: namespace: system
fpga_admissionwebhook/certmanager/certificate.yaml: namespace: system
fpga_admissionwebhook/default/kustomization.yaml:namespace: intelfpgawebhook-system
fpga_admissionwebhook/manager/manager.yaml: namespace: system
fpga_admissionwebhook/rbac/role_binding.yaml: namespace: system
fpga_admissionwebhook/webhook/kustomizeconfig.yaml:namespace:
fpga_admissionwebhook/webhook/manifests.yaml: namespace: system
fpga_admissionwebhook/webhook/service.yaml: namespace: system
fpga_plugin/base/intel-fpga-plugin-daemonset.yaml: namespace: system
fpga_plugin/base/role_binding.yaml: namespace: system
fpga_plugin/overlays/af/kustomization.yaml:namespace: intelfpgaplugin-system
fpga_plugin/overlays/region/kustomization.yaml:namespace: intelfpgaplugin-system
fpga_plugin/overlays/region/mode-region.yaml: namespace: system
gpu_plugin/overlays/fractional_resources/resource-cluster-role-binding.yaml: namespace: default
gpu_plugin/overlays/namespace_kube-system/add-namespace-kube-system.yaml: namespace: kube-system
iaa_plugin/overlays/iaa_initcontainer/iaa-config.yaml: namespace: inteldeviceplugins-system
nfd/overlays/node-feature-discovery/node-feature-discovery-openshift.yaml: namespace: openshift-nfd
operator/certmanager/certificate.yaml: namespace: system
operator/certmanager/certificate.yaml: namespace: system
operator/crd/bases/deviceplugin.intel.com_dlbdeviceplugins.yaml: namespace:
operator/crd/bases/deviceplugin.intel.com_dsadeviceplugins.yaml: namespace:
operator/crd/bases/deviceplugin.intel.com_fpgadeviceplugins.yaml: namespace:
operator/crd/bases/deviceplugin.intel.com_gpudeviceplugins.yaml: namespace:
operator/crd/bases/deviceplugin.intel.com_iaadeviceplugins.yaml: namespace:
operator/crd/bases/deviceplugin.intel.com_qatdeviceplugins.yaml: namespace:
operator/crd/bases/deviceplugin.intel.com_sgxdeviceplugins.yaml: namespace:
operator/crd/kustomizeconfig.yaml:namespace:
operator/crd/patches/webhook_in_fpgadeviceplugins.yaml: namespace: system
operator/crd/patches/webhook_in_gpudeviceplugins.yaml: namespace: system
operator/crd/patches/webhook_in_qatdeviceplugins.yaml: namespace: system
operator/default/kustomization.yaml:namespace: inteldeviceplugins-system
operator/default/manager_auth_proxy_patch.yaml: namespace: system
operator/default/manager_webhook_patch.yaml: namespace: system
operator/device/dlb/dlb.yaml: namespace: inteldeviceplugins-system
operator/device/dsa/dsa.yaml: namespace: inteldeviceplugins-system
operator/device/fpga/fpga.yaml: namespace: inteldeviceplugins-system
operator/device/gpu/gpu.yaml: namespace: inteldeviceplugins-system
operator/device/qat/qat.yaml: namespace: inteldeviceplugins-system
operator/device/sgx/sgx.yaml: namespace: inteldeviceplugins-system
operator/manager/manager.yaml: namespace: system
operator/manifests/bases/intel-device-plugins-operator.clusterserviceversion.yaml: namespace: placeholder
operator/rbac/auth_proxy_role_binding.yaml: namespace: system
operator/rbac/auth_proxy_service.yaml: namespace: system
operator/rbac/leader_election_role_binding.yaml: namespace: system
operator/rbac/role_binding.yaml: namespace: system
operator/webhook/kustomizeconfig.yaml:namespace:
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/manifests.yaml: namespace: system
operator/webhook/service.yaml: namespace: system
sgx_admissionwebhook/base/manager_webhook_patch.yaml: namespace: system
sgx_admissionwebhook/certmanager/certificate.yaml: namespace: system
sgx_admissionwebhook/certmanager/certificate.yaml: namespace: system
sgx_admissionwebhook/manager/manager.yaml: namespace: system
sgx_admissionwebhook/overlays/default-with-certmanager/kustomization.yaml:namespace: intelsgxwebhook-system
sgx_admissionwebhook/webhook/kustomizeconfig.yaml:namespace:
sgx_admissionwebhook/webhook/manifests.yaml: namespace: system
sgx_admissionwebhook/webhook/service.yaml: namespace: system
sgx_plugin/overlays/epc-register/kustomization.yaml:namespace: kube-system
sgx_plugin/overlays/epc-register/service-account.yaml: namespace: kube-system
sgx_plugin/overlays/epc-register/service-account.yaml: namespace: kube-system
vpu_plugin/overlays/namespace_kube-system/add-namespace-kube-system.yaml: namespace: kube-system
```

For example, when using operator, GPU plugin goes to `inteldeviceplugins-system` ns, when using GPU plugin README apply method, it goes to `default` ns, and when using `gpu_plugin/overlays/namespace_kube-system` overlay, it goes to `kube-system` ns. Some of the other plugins, use different namespaces, but that's not consistent either.

GPU plugin also uses different service account & roles depending on installation method (this is from repo root):
```
$ git grep gpu-manager
Makefile: $(CONTROLLER_GEN) rbac:roleName=gpu-manager-role paths="./cmd/gpu_plugin/..." output:dir=deployments/operator/rbac
charts/operator/templates/operator.yaml: name: inteldeviceplugins-gpu-manager-role
deployments/operator/rbac/gpu_manager_role.yaml: name: gpu-manager-role
pkg/controllers/gpu/controller.go: serviceAccountName = "gpu-manager-sa"
pkg/controllers/gpu/controller.go: Name: "gpu-manager-sa",
pkg/controllers/gpu/controller.go: Name: "gpu-manager-rolebinding",
pkg/controllers/gpu/controller.go: Name: "gpu-manager-sa",
pkg/controllers/gpu/controller.go: Name: "inteldeviceplugins-gpu-manager-role",

$ git grep resource-reader
cmd/gpu_plugin/README.md:serviceaccount/resource-reader-sa created
cmd/gpu_plugin/README.md:clusterrole.rbac.authorization.k8s.io/resource-reader created
cmd/gpu_plugin/README.md:clusterrolebinding.rbac.authorization.k8s.io/resource-reader-rb created
deployments/gpu_plugin/overlays/fractional_resources/add-serviceaccount.yaml: serviceAccountName: resource-reader-sa
deployments/gpu_plugin/overlays/fractional_resources/kustomization.yaml: - resource-reader-sa.yaml
deployments/gpu_plugin/overlays/fractional_resources/resource-cluster-role-binding.yaml: name: resource-reader-rb
deployments/gpu_plugin/overlays/fractional_resources/resource-cluster-role-binding.yaml: name: resource-reader-sa
deployments/gpu_plugin/overlays/fractional_resources/resource-cluster-role-binding.yaml: name: resource-reader
deployments/gpu_plugin/overlays/fractional_resources/resource-cluster-role.yaml: name: resource-reader
deployments/gpu_plugin/overlays/fractional_resources/resource-reader-sa.yaml: name: resource-reader-sa
```