d-f-s: assign a better ratio between container and image removals
Right now, I have taken the 'easy' road:
- if the free disk size is below
target
- compute
removal_target = target - current_free_disk_size
- remove up to
removal_target
containers and images
This is not so bad because the computation of the size of the containers and images are not accurate. Once #6 is done, this will mean that we will free far too much space.
We should give a ratio of removal_target
for containers and images so we do not free too much images/containers that might be reused later