fix api-gateway import tests (GoogleCloudPlatform#5104)

mmv1/products/apigateway/api.yaml

@@ -46,6 +46,8 @@ objects:
     base_url: projects/{{project}}/locations/global/apis
     update_verb: :PATCH
     update_mask: true
+    identity:
+      - apiId
     description: |
       A consumable API that can be used by multiple Gateways.
     references: !ruby/object:Api::Resource::ReferenceLinks
@@ -96,6 +98,8 @@ objects:
     update_mask: true
     description: |
       An API Configuration is an association of an API Controller Config and a Gateway Config
+    identity:
+      - apiConfigId
     references: !ruby/object:Api::Resource::ReferenceLinks
       guides:
         'Official Documentation':
@@ -185,6 +189,8 @@ objects:
     base_url: projects/{{project}}/locations/{{region}}/gateways
     update_verb: :PATCH
     update_mask: true
+    identity:
+      - gatewayId
     description: |
       A consumable API that can be used by multiple Gateways.
     references: !ruby/object:Api::Resource::ReferenceLinks

mmv1/products/apigateway/terraform.yaml

@@ -24,6 +24,7 @@ overrides: !ruby/object:Overrides::ResourceOverrides
       method_name_separator: ':'
       parent_resource_attribute: 'api'
       base_url: projects/{{project}}/locations/global/apis/{{api}}
+      import_format: ["projects/{{project}}/locations/global/apis/{{api}}", "{{project}}/{{api}}", "{{api}}"]
     examples:
       - !ruby/object:Provider::Terraform::Examples
         min_version: beta
@@ -99,6 +100,7 @@ overrides: !ruby/object:Overrides::ResourceOverrides
       method_name_separator: ':'
       parent_resource_attribute: 'gateway'
       base_url: projects/{{project}}/locations/{{region}}/gateways/{{gateway}}
+      import_format: ["projects/{{project}}/locations/{{region}}/gateways/{{gateway}}", "{{project}}/{{region}}/{{gateway}}", "{{region}}/{{gateway}}", "{{gateway}}"]
     examples:
       - !ruby/object:Provider::Terraform::Examples
         min_version: beta