Fix bug that using wrong capacity in trash sweep policy (#1156)
Fix bug that using wrong capacity in trash sweep policy (#1156)

We should use total disk usage capacity instread of data used capacity,
otherwise, the config 'disk_capacity_insufficient_percentage' will not work.
imay/palo,imay/palo,imay/palo,imay/palo,imay/palo,imay/palo