Re-use version file for terraform

cesnet-mcc/terraform/versions.tf

-terraform {
-  required_providers {
-    local = "~> 2.0"
-    openstack = {
-      source  = "terraform-provider-openstack/openstack",
-      version = ">= 1.38.0"
-    }
-  }
-  required_version = ">= 0.13"
-}

cesnet-mcc/terraform/versions.tf

+../../common/terraform/versions.tf
\ No newline at end of file

testing/terraform/versions.tf

-provider "openstack" {
-}
-
-terraform {
-  required_providers {
-    local = "~> 2.0"
-    openstack = {
-      source  = "terraform-provider-openstack/openstack",
-      version = ">= 1.38.0"
-    }
-  }
-  required_version = ">= 0.13"
-}

testing/terraform/versions.tf

+../../common/terraform/versions.tf
\ No newline at end of file