arc/cli/args/base.py: make "--list-full" short arg "-L" instead of "-ll"

It's a matter of preference, but also follows the GNU guidelines and has
a slightly better analogy (-l == small list, -L == big list).

Signed-off-by: Cleber Rosa <crosa@redhat.com>
server command: accept action to list all installation profiles.

For the server command, use -l or --list-install-profiles to list
the available installation profiles on the install server.

Signed-off-by: Ruda Moura <rmoura@redhat.com>