use new iam variables in kms module

tests/modules/kms/fixture/main.tf

@@ -16,8 +16,8 @@
 
 module "test" {
   source               = "../../../../modules/kms"
-  iam_members          = var.iam_members
-  key_iam_members      = var.key_iam_members
+  iam                  = var.iam
+  key_iam              = var.key_iam
   key_purpose          = var.key_purpose
   key_purpose_defaults = var.key_purpose_defaults
   keyring              = var.keyring

tests/modules/kms/fixture/variables.tf

@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-variable "iam_members" {
+variable "iam" {
   type = map(list(string))
   default = {
     "roles/owner" = ["user:ludo@ludomagno.net"]
   }
 }
 
-variable "key_iam_members" {
+variable "key_iam" {
   type = map(map(list(string)))
   default = {
     key-a = {