def move(self, path, raise_if_exists=False):
        self.rename(path, raise_if_exists=raise_if_exists)
Returns a string suitable for RFC 2822 compliant Message-ID, e.g:
dataset/ETHPy150Open spotify/luigi/luigi/contrib/hdfs/target.py/HdfsTarget.move--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/core/mail/message.py/make_msgid