Remove useless method iter_member_persons_role_and_id from "measure_performance" script.
Remove useless method iter_member_persons_role_and_id from "measure_performance" script.

openfisca/openfisca-core,openfisca/openfisca-core,benjello/openfisca-core,sgmap/openfisca-core,adrienpacifico/openfisca-core,benjello/openfisca-core