code: def _setup_imports(self):
          
          for fullname, _, _ in self.module_map['custom']:
              mitogen.core.import_module(fullname)
          for fullname in self.module_map['builtin']:
              mitogen.core.import_module(fullname)
docs: Ensure the local importer and PushFileService has everything for the
          Ansible module before setup() completes, but before detach() is called
          in an asynchronous task.
  
          The master automatically streams modules towards us concurrent to the
          runner invocation, however there is no public API to synchronize on the
          completion of those preloads. Instead simply reuse the importer's
          synchronization mechanism by importing everything the module will need
          prior to detaching.