Eliminate requirement of `sudo` in `l99 disk` command

[bburns]

yeah there's something in the docker setups that led to folders in the setup being owned by root, so need sudo to see disk space. maybe could work around. will add to list. ob: IMO this needs to be investigated and fixed. I think I could help you if you give me some pointers where the problem lays. Or is the ownership changed by external tools (e.g. Docker)?