wocky-data-forms-test: factor out create_form_stanza
wocky-data-forms-test: factor out create_form_stanza

freedesktop-unofficial-mirror/wocky,noonien-d/wocky,noonien-d/wocky,noonien-d/wocky,freedesktop-unofficial-mirror/wocky,freedesktop-unofficial-mirror/wocky