GetDefinitionRevision.
        [Preview API] Get release definition for a given definitionId and revision
        :param str project: Project ID or project name
        :param int definition_id: Id of the definition.
        :param int revision: Id of the revision.
        :rtype: object

def get_definition_revision(self, project, definition_id, revision, **kwargs):
        """GetDefinitionRevision.
        [Preview API] Get release definition for a given definitionId and revision
        :param str project: Project ID or project name
        :param int definition_id: Id of the definition.
        :param int revision: Id of the revision.
        :rtype: object
        """
        route_values = {}
        if project is not None:
            route_values['project'] = self._serialize.url('project', project, 'str')
        if definition_id is not None:
            route_values['definitionId'] = self._serialize.url('definition_id', definition_id, 'int')
        if revision is not None:
            route_values['revision'] = self._serialize.url('revision', revision, 'int')
        response = self._send(http_method='GET',
                              location_id='258b82e0-9d41-43f3-86d6-fef14ddd44bc',
                              version='5.1-preview.1',
                              route_values=route_values,
                              accept_media_type='text/plain')
        if "callback" in kwargs:
            callback = kwargs["callback"]
        else:
            callback = None
        return self._client.stream_download(response, callback=callback)