Fix perma diff problem during TF import (GoogleCloudPlatform#7348)

mmv1/products/cloudidentity/terraform.yaml

@@ -52,7 +52,7 @@ overrides: !ruby/object:Overrides::ResourceOverrides
     custom_code: !ruby/object:Provider::Terraform::CustomCode
       pre_create: templates/terraform/pre_create/hide_dynamic_label.erb
       post_create: templates/terraform/post_create/unhide_dynamic_label.erb
-      custom_import: templates/terraform/custom_import/set_id_name_with_slashes.go.erb
+      custom_import: templates/terraform/custom_import/cloud_identity_group_import.go.erb
   GroupMembership: !ruby/object:Overrides::Terraform::ResourceOverride
     read_error_transform: "transformCloudIdentityGroupMembershipReadError"
     docs: !ruby/object:Provider::Terraform::Docs

mmv1/templates/terraform/custom_import/cloud_identity_group_import.go.erb

@@ -0,0 +1,18 @@
+config := meta.(*Config)
+
+// current import_formats can't import fields with forward slashes in their value
+if err := parseImportId([]string{"(?P<name>.+)"}, d, config); err != nil {
+	return nil, err
+}
+
+name := d.Get("name").(string)
+
+if d.Get("initial_group_config") == nil {
+    d.Set("initial_group_config", "EMPTY")
+}
+
+if err := d.Set("name", name); err != nil {
+	return nil, fmt.Errorf("Error setting name: %s", err)
+}
+d.SetId(name)
+return []*schema.ResourceData{d}, nil