Return a list of tuples taken from self.args.stdout
        [(plugin, attribute), ... ]

def build_list(self):
        """Return a list of tuples taken from self.args.stdout
        [(plugin, attribute), ... ]"""
        ret = []
        for p in self.args.stdout.split(','):
            if '.' in p:
                p, a = p.split('.')
            else:
                a = None
            ret.append((p, a))
        return ret