add server id for standard igm

Author: ScottSuarez

mmv1/products/compute/InstanceGroupManager.yaml

@@ -65,6 +65,12 @@ properties:
       hyphen and a random four-character string to the base instance name.
       The base instance name must comply with RFC1035.
     required: true
+  - name: 'instanceGroupManagerId'
+    type: Integer
+    description: |
+      The unique identifier number for the resource. This identifier is defined by the server.
+    api_name: id
+    output: true
   - name: 'creationTimestamp'
     type: Time
     description: |

mmv1/third_party/terraform/services/compute/resource_compute_region_instance_group_manager_test.go.tmpl

@@ -28,6 +28,9 @@ func TestAccRegionInstanceGroupManager_basic(t *testing.T) {
 		Steps: []resource.TestStep{
 			{
 				Config: testAccRegionInstanceGroupManager_basic(template, target, igm1, igm2),
+        Check: resource.ComposeTestCheckFunc(
+          resource.TestCheckResourceAttrSet(
+            "google_compute_region_instance_group_manager.igm-basic", "instance_group_manager_id")),
 			},
 			{
 				ResourceName:            "google_compute_region_instance_group_manager.igm-basic",