to master was merged patch that removed default values for engine options [1]. Now all values are present in 0000_config. For adding new engine option, besides adding it in ConfigValues, add it also into 0000_config (using procedure fn_db_add_config_value or fn_db_add_config_value_for_versions_up_to).

Thanks,

Mirka

[1] https://gerrit.ovirt.org/#/c/81464/