cli: use macro for list of argument for NmcMetaGenericInfo.get_fcn()

The reasons are:

- I want to locate all implmenetations of the get_fcn() handler. By
  consistently using this macro, you can just grep for the macro and
  find them all.

- all implementations should follow the same style. This macro
  enforces the same names for arguments and avoids copy&paste.

- if we are going to add or change an argument, it becomes easier.
  That's because we can easily identify all implementation and can
  change arguments in one place.

clients/cli/utils.c

@@ -93,7 +93,8 @@ _meta_type_nmc_generic_info_get_fcn (const NMMetaAbstractInfo *abstract_info,
 	nm_assert (out_to_free || NM_IN_SET (get_type, NM_META_ACCESSOR_GET_TYPE_COLOR));
 
 	if (info->get_fcn) {
-		return info->get_fcn (environment, environment_user_data,
+		return info->get_fcn (environment,
+		                      environment_user_data,
 		                      info, target,
 		                      get_type,
 		                      get_flags,