Add vSphere external cloud provider (#5959)

docs/vsphere-csi.md

docs/vsphere.md

inventory/sample/group_vars/all/all.yml

inventory/sample/group_vars/all/vsphere.yml

roles/kubernetes-apps/csi_driver/vsphere/defaults/main.yml

roles/kubernetes-apps/csi_driver/vsphere/tasks/main.yml

...ps/csi_driver/vsphere/tasks/vsphere-credentials-check.yml

.../csi_driver/vsphere/templates/vsphere-csi-cloud-config.j2

...iver/vsphere/templates/vsphere-csi-controller-rbac.yml.j2

...driver/vsphere/templates/vsphere-csi-controller-ss.yml.j2

...apps/csi_driver/vsphere/templates/vsphere-csi-node.yml.j2

...s/kubernetes-apps/external_cloud_controller/meta/main.yml

...-apps/external_cloud_controller/vsphere/defaults/main.yml

...tes-apps/external_cloud_controller/vsphere/tasks/main.yml

...ud_controller/vsphere/tasks/vsphere-credentials-check.yml

...lates/external-vsphere-cloud-controller-manager-ds.yml.j2

...nal-vsphere-cloud-controller-manager-role-bindings.yml.j2

...es/external-vsphere-cloud-controller-manager-roles.yml.j2

...templates/external-vsphere-cpi-cloud-config-secret.yml.j2

...er/vsphere/templates/external-vsphere-cpi-cloud-config.j2