Code review comment for ~afreiberger/charm-juju-lxd:init_with_dir_storage

This is untested. we should add this as a new charm to yobuko, and rebuild one of the boxes under this charm to test dir-based lxd deployment. Charmlab3/ewah is free for this from my perspective.

This change is necessary to work around https://github.com/conjure-up/conjure-up/issues/1430 where kubernetes-worker won't run kubelet service under a zfs/btrfs backed lxd.