Pagers are properly imported when they live in subpackages (#307)

Author: software-dov

gapic/schema/wrappers.py

@@ -516,8 +516,7 @@ def client_output(self):
             return PythonType(meta=metadata.Metadata(
                 address=metadata.Address(
                     name=f'{self.name}Pager',
-                    package=self.ident.api_naming.module_namespace + (
-                        self.ident.api_naming.versioned_module_name,
+                    package=self.ident.api_naming.module_namespace + (self.ident.api_naming.versioned_module_name,) + self.ident.subpackage + (
                         'services',
                         utils.to_snake_case(self.ident.parent[-1]),
                     ),