Added member attribute to compute default sa datasource

.changelog/8767.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+compute: added `member` attribute to `google_compute_default_service_account` datasource
+```

google-beta/services/compute/data_source_google_compute_default_service_account.go

@@ -35,6 +35,10 @@ func DataSourceGoogleComputeDefaultServiceAccount() *schema.Resource {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
+			"member": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
 		},
 	}
 }
@@ -82,6 +86,9 @@ func dataSourceGoogleComputeDefaultServiceAccountRead(d *schema.ResourceData, me
 	if err := d.Set("display_name", sa.DisplayName); err != nil {
 		return fmt.Errorf("Error setting display_name: %s", err)
 	}
+	if err := d.Set("member", "serviceAccount:"+sa.Email); err != nil {
+		return fmt.Errorf("Error setting member: %s", err)
+	}
 
 	return nil
 }

website/docs/d/compute_default_service_account.html.markdown

@@ -37,3 +37,5 @@ The following attributes are exported:
 * `name` - The fully-qualified name of the service account.
 
 * `display_name` - The display name for the service account.
+
+* `member` - The Identity of the service account in the form `serviceAccount:{email}`. This value is often used to refer to the service account in order to grant IAM permissions.