-l is deprecated && long option are more readable

in last doc (http://www.freedesktop.org/software/systemd/man/journalctl.html) we can read : 
> The old options -l/--full are not useful anymore, except to undo --no-full.

with systemd 204-14 that generate this error : 
    invalid option -- 'l'
Merge pull request #633 from tclavier/patch-1

fleetctl journal: -l is deprecated && long options are more readable