While adding scrub to data in last commit I noticed that the help output
where all over the place, both "physically" on the console and also
things like inconsistent case and newlines before "Report bugs to ...",
so I decided to fix all that up.
Add a command for stripping allocation info for a filesystem.
This is primarily to test codepaths used by the new image creation tool.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
