Package alterator-module-executor: Information

- Add a new option - exit_status. Methods no longer return an exit_status by
  default. To add the 'response' return value to a method, you need to add an
  'exit_status = true' to the method definition in configuration file.

- Add the ability to create return values of type array of strings in methods
  with multiple return values. The names of these values are specified in the
  stdout_json parameter (array of strings) and have square brackets at the end
  (name[]).
- Fix call g_close with an invalid file descriptor.
- Replace function g_spawn_check_exit_status with function
  g_spawn_check_wait_status if GLIB version is greater than or equal to 2.70.

- Fix duplication of signals in introspection.