Added terraform support for NIFCLOUD (#10227)

.gitlab-ci/terraform.yml

contrib/terraform/nifcloud/.gitignore

contrib/terraform/nifcloud/README.md

contrib/terraform/nifcloud/generate-inventory.sh

contrib/terraform/nifcloud/main.tf

...rib/terraform/nifcloud/modules/kubernetes-cluster/main.tf

.../terraform/nifcloud/modules/kubernetes-cluster/outputs.tf

...cloud/modules/kubernetes-cluster/templates/userdata.tftpl

...erraform/nifcloud/modules/kubernetes-cluster/terraform.tf

...erraform/nifcloud/modules/kubernetes-cluster/variables.tf

contrib/terraform/nifcloud/output.tf

contrib/terraform/nifcloud/sample-inventory/cluster.tfvars

contrib/terraform/nifcloud/sample-inventory/group_vars

contrib/terraform/nifcloud/terraform.tf

contrib/terraform/nifcloud/variables.tf