service: don't log `keybase fs` command line params
service: don't log `keybase fs` command line params

To avoid leaking filenames.

Issue: HOTPOT-68

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client