Add a list of item into the container

        :data: dict of items & value per hostname

def add(self, data):
        """
        Add a list of item into the container

        :data: dict of items & value per hostname
        """
        for host in data:
            for key in data[host]:
                if not data[host][key] == []:
                    self.add_item(host, key, data[host][key])