Moving the chronograph app to fle_utils

I was going to move this into its own repo, but I think it's not quite mature for that.  It's still a stand-alone tool, so `fle-utils` seemed the best place for it!

Goal is to get securesync down to 3 dependencies:
`annoying` (external dependency)
`fle-utils`

Then, refactoring should be relatively easy...

All I did here was move `config` into `fle_utils` and update all imports.  I even added a docstring to `config`, @aronasorman  !