Returns the default collector settings

def get_default_config(self):
        """
        Returns the default collector settings
        """
        config = super(MemoryCgroupCollector, self).get_default_config()
        config.update({
            'path':     'memory_cgroup',
            'memory_path': '/sys/fs/cgroup/memory/',
            'skip': [],
        })
        return config